I see it now... Very hard to read without that hat, because the shadow over the eyes is meaningless here and thus doesn't read as anything.
I usually dig your simple style, but I think there's a fine line between simplicity and nothing. I see nothing. If it's representational art then I think it has failed, if it's nonrepresentational then I don't find it aesthetically pleasing or evocative. This is a 'not sure if troll' situation. If it's just meant as an avatar and not a finished work then its acceptance to the gallery is a non-issue.
Yeah, in original hat was the readable object, which was the key to understanding what's beneath it. Without it there is no point of reference and it all reads as random noise. Better use that picture with hat.