Make it 63 (31?) to align with what C99 can distinguish.
Also: I really like unicode in identifiers. So if at all possible don’t just have a random string of letters and numbers, make sure to include greek letters and all the funny emojis. (I just forgot which languages and compilers etc allow that.)
I think they don’t take inspiration from Photoshop. Either it’s been a clone of a different product at some time or they developed it themselves. Hence the differences. I mean the whole UI doen’t really resemble similarity to Photoshop.