Writing and drawing amputee characters: Not every amputee wears prosthetics (and that's ok)
Not every amputee wears prosthetics, and not doing so is not a sign that they've "given up".
It's a bit of a trope that I've noticed that when an amputee, leg amputees in particular, don't wear prosthetics in media its often used as a sign that they've given up hope/stopped trying/ are depressed etc. If/when they start feeling better, they'll start wearing their prosthetics again, usually accompanied by triumphant or inspiring music (if it's a movie). The most famous example of this is in Forest Gump, Where Dan spends most of the movie after loosing his legs wishing he'd died instead. He does eventually come around, and him finally moving from his wheelchair to prosthetics is meant to highlight this.
The thing is, it's not that it's unrealistic - in fact my last major mental health spiral was started because one of my prosthetics was being a shit and wouldn't go on properly, despite fitting perfectly at the prosthetist's the day before. I'm not going to use my legs when I'm not in a good headspace, but the problem is, this is the only time non-prosthetic using amputees ever get representation: to show how sad they are. Even if that's not what the creator/writer necessarily intended, audiences will often make that assumption on their own unless you're very careful and intentional about how you frame it, because it's what existing media has taught them to expect.
But there are lots of reasons why someone might not use prosthetics:
they might not need them: this is more common in arm amputees because of how difficult it can be to use arm prosthetic, especially above-elbow prosthetics. Most folks learn how to get on without them pretty well. In fact, most of the arm amputees I know don't have prosthetics, or only have them for specific tasks (e.g. I knew a girl who had a prosthetic hand made specifically for rowing, but that's all she used it for).
Other mobility aids just work better for them: for me, I'm faster, more manoeuvrable and can be out for longer when I'm in my wheelchair than I ever could on my prosthetics. Youtube/tik tok creator Josh Sundquist has said the same thing about his crutches, he just feels better using them than his prosthetic. This isn't the case for everyone of course, but it is for some of us. Especially people with above-knee prosthetics, in my experience.
Other disabilities make them harder to use: Some people are unable to use prosthetics due to other disabilities, or even other amputations. Yeah, as it turns out, a lot of prosthetics are only really designed for single-limb amputees. While they're usable for multi-limb amps, they're much harder to use or they might not be able to access every feature. For example, the prosthetic knee I have has the ability to monitor the walk cycle of the other leg and match it as close as possible - but that only works if you have a full leg on the other side. Likewise, my nan didn't like using her prosthetic, as she had limited movement in her shoulders that meant she physically couldn't move her arms in the right way to get her leg on without help.
Prosthetics are expensive in some parts of the world: not everyone can afford a prosthetic. My left prosthetic costs around $5,000 Australian dollars, but my right one (the above knee) cost $125,000AUD. It's the most expensive thing I own that I only got because my country pays for medical equipment for disabled folks. Some places subsidise the cost, but paying 10% of $125,000 is still $12,500. Then in some places, if you don't have insurance, you have to pay for that all by yourself. Even with insurance you still have to pay some of it depending on your cover. Arm prosthetics are even more expensive. Sure, both arms and legs do have cheaper options available, but they're often extremely difficult to use. You get what you pay for.
they aren't suitable for every type of environment: Prosthetics can be finicky and modern ones can be kind of sensitive to the elements. My home town was in a coastal lowland - this means lots of beaches and lots of swamp filled with salty/brackish water. The metals used in prosthetics don't hold up well in those conditions, and so they would rust quicker, I needed to clean them more, I needed to empty sand out of my foot ALL THE TIME (there always seemed to be more. It was like a bag of holding but it was just sand). Some prosthetics can't get wet at all. There were a few amputees who moved to the area when I was older who just didn't bother lol. It wasn't worth the extra effort needed for the maintenance.
People have allergies to the prosthetic material: This is less of a problem in the modern day, but some people are allergic to the materials their prosthetics are made from. You can usually find an alternative but depending on the type of allergy, some people are allergic to the replacements too.
Some people just don't like them.
There's nothing wrong with choosing to go without a prosthetic. There's nothing wrong with deciding they aren't for you. It doesn't make you a failure or sad or anything else. Using or not using prosthetics is a completely morally neutral thing.
Please, if you're writing amputees, consider if a prosthetic really is the best mobility aid for your character and consider having your characters go without, or at least mix it up a bit.
For example, Xari, one of the main characters in my comic, uses prosthetics unsupported and with crutches, and uses a wheelchair. They alternate between them throughout the story.