How could I improve?

Honestly, I have never drawn a guy...this is the first (except for Joker-Green Goblin thingy...)

Always, have been drawing cartoon style...
anyway, could you guys, like, tell me how I can improve my drawing??..:))
LOLx
I was suppose to pass this for the cap reborn thingy contest...but unfortunately,
I think I didn't pass it on time...
neeway!
I know it's not good, but ...that's the reason why I'm asking for comments...
hope I get possitive remarks...
ready for critics!!



















thank you!!:))
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