Some artists deliberately work small. Or not so deliberately. Alberto Giacometti, for instance, once wrote to his brother that he started out making large sculptures but by the time he was finished they ended up small—which is something that tends to happen if your sculpting medium is stone or wood or something that has to be carved down, although he tended to create works in plaster that he then recast in metal, building up. And later he complained to his brother that every time he started to make a small piece it would end up large, which is even weirder.
I see a lot of small graffiti which isn’t weird. Because it’s illegal most artists work fast and dirty, and there are a lot of small tags scribbled around. Once I saw where someone had started something then wrote “Fuck! Cops!” and I wish I’d gotten a picture of it because that’s hilarious, but that’s another story.
Anyway I notice that some artists, even when they get the chance to work big, don’t do much more than larger versions of those quick and dirty scribbles. Is it lack of skill? Are they just not interested in doing something better? I don’t know. Maybe even in places where they’re less concerned about being caught they still feel pressed for time. And then there are those who, given the chance, go big.