real talk @ one of those headcanons,,,, is solas one of those kind of painters who gets so into painting that he doesn't have the patience to clean the brush after each color in water so he licks it clean (or sometimes gets distracted while thinking and puts a dirty paint brush in his mouth without realizing)
With frescoes, he can’t do that? Any mistakes would just... devastate him, honestly, so he’s very careful when it comes to that. Like his attention becomes so super focused that he won’t recognize anything else. But with regular painting? Definitely. If he’s painting just a regular picture or charcoal relief, he’ll often forget the paint/charcoal on his fingers and then touch his face. Sometimes he’ll cross his arms and tip the dirty brush against his chin to think, resulting in a smudge of color in the dip of his chin.