Hi. I am not familiar with knitting at all. May I ask why you feel it's not perfect? Just trying to understand if it's a personal opinion or actual fault somewhere (that I don't see).
I'm probably my own worst critic, but I guess some spots don't look as "polished" or "neat" to me as I'd like. Some of the ribbing on the neck collar looks a little uneven. It's just small things that are probably more noticeable to me than anyone else. Also, it was only the 2nd sweater I ever knit, so I'm self-conscious about how good my work looks to anyone else.
Don't be so harsh on yourself, it's awesome! The imperfections are the perfect level that will make another knitter go "Oh wow that's selfmade. So cool!" while other people won't notice them at all. Really nice work!