I'm currently working on a new version of Juri's character sheet. I'm not 100% satisfied with this drawing. I think I'll make some corrections before I start with the line art.
Whenever I'm not satisfied with a drawing, I usually put it aside for this day instead of forcing it. When I look at it the next day it's often easier for me to improve the drawing. A good night's sleep works wonders!
There's really no need to feel bad if it doesn't look good the first try! I most cases, I need to correct a drawing a few times until it looks like in the final version. It's a process.
When I was younger, it happened a lot to me that I noticed a lot of mistakes only after I finished a drawing. I was angry at myself because I didn't notice them earlier. ^^;
Now I'm more patient and take a bit more time for the refining process. You don't need to be a perfectionist, of course, but I think it's worth it to step back and wait a bit before you start with the final line art. This way it's easier to notice things that look off before it's too late for corrections.
It's surprising how even small corrections can make a big difference!