The first one is good but the second is too small and it has a lot of white spots. Good job overall though. P.S.: There's already a guy named Stealth here...
on the 2nd render theres a white line around it or sumthing, n also at the middle of his arm/leg gap theres a line of sumthing
they are not too bad, use the background removal tool on the white space and just use protect foreground color with the space you are tryin to cut around and its alot easier, also the car render seems liek you cut part of the tire off :/