watch your transitions (cutting too deep) - like his glove finger to pant leg.
also, suggestion is to choose higher quality photos to cut. I know it's difficult, especially with requests sometimes, though
just to add on to what jarrod said, it looks like you rushed this, if you notice on the helmet, there's areas where there should be sharp corners, but you have them rounded off
don't get me wrong, its still a good cut, just take your time and work on your transitions like jarrod said