Your missin some stuff, and you cut too much on others.
Pic 1. Too sharp. You cut too much on his feet. and on the left side you cut too little and made it too angular.
Pic 2. Always a bad idea to use pics with so much lighting. You cut freds elbow.
Pic 3. You cut WAAAAAY too much on his pants. Like i can see where his pants should be and they aren't cus you cut it.
(usually you don't wanna pick renders with cut offs like the head).
You also missed the inside right by the barel.
Overall: keep at it. Ctrl+z and ctrl+shift+z are your friends.
Oh and this might help: try putting ona black or white background with the intended render on top. THat way you will spot things a lot quicker and big mistakes/bad looks can be avoided much more easily.