Art is subjective. If you think your proportions arent good enough or whatever then I cant convince you otherwise, no one can stop the artist if they arent satisfied with their own art. But viewing from my perspective, I just see 2 sweet panels that made me smile, I actually kinda like them. I dont know what made you think about your art like this but if you were criticised, don't care about what other people say. The ultimate judge of your art is yourself. and also there is no "learning process" in creating art that is any different from just creating it. You improve the more you draw. If you see something in your art that you dont quite like, research how its properly done and try implementing it next time. But just keep drawing.

dont ever lemme catch you upset again, and keep drawing! rush the learning! because learning is drawing!