Here's another edit! I based this one off of Bengoshia's. (Hope you don't mind!)
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First I reoriented the light-source so that it was coming from the top instead of the side, just so that if this were to be put in a game, running to the left would not make the lighting on the character appear to change.
I also used a mix of Bengoshia's palette plus your dino-hoodie's original shade of green.
I fiddled around with colored outlines for a bit, not too happy with them, the flesh on the arms and legs may be outlined a bit too lightly compared to the other parts. Also, I would suggest that you open his right hand so you can see the claws there as well, it looks a little odd at the moment.
I added a lot of small details to sell the outfit a bit more, like the folds in the pants along the leg (which are questionable, though) and at the bottom, same for the sleeves and waist of the shirt. Punched the shading a bit harder on the hand so that the fingers come forward more.
Changed the shoes from nondescript brown shoes to white sneakers, as I thought it fit a bit better with the character.
Any questions on anything else I did?