We took a break from drawing somewhere in that age range for just about exactly that. Starting maybe around 2.5. If I would try to help his feelings in any way DS would take it wrong and feel worse. For him it was better to just have a break from it. He was okay with playdoh being imperfect, and with cutting and pasting (where he would tell me very specific stuff cut and then he would glue them on paper how he wanted them to go) -- so he still did artsy stuff, just more crafts than drawing.
Interestingly a large gap of time improved his drawing skills some (brain maturation I guess) and he's happier with how things come out. For DS, chalk, dry erase markers and pencils, window crayons are still the best options and he erases quite a bit.
Polly
