rotate the body so it's not leaning like that, thin out the thicker lines (or make most of the lines thicker except for the details), and fill in the white lines

^ my attempt at improving it
the feet look awkward too but i didn't try changing those
ps: don't fill in the color on the same layer as the outlines, instead make a new layer underneath the lines and use the fillcan and set it to expand by 2-3 pixels:

and if you're not already, turn up the correction setting on the pen tool
it actually did take 2 hours
also
wait just a second
you dont call yourself a pro?
WAIT JUST A LITTLE SEC
snip
i would post the rest of this wonderful message but after replying it took me to drama about a month ago sooo
thinking you have talent =/= thinking you're a "pro"