Hey! Hello there! I absolutely love the design of this character, I see some jagged lines there, but without that it's perfect!. For me, the black outline didn't look too good. so I changed its color, here you can see what I did;
If you like it, you can re-upload it ! :)
Hey I figured that out too but I haven't learned AA yet. Your fix is really neat, I'll take note in the future :D