pretty good, he kinda looks like the main char from 'they live'
crits, first pic, his gun arm should get a little bigger as it comes closer to the camera. perspective being what it is, and all. and he's missing a belly button and has a ginormous 8 pack. good job on the wrinkles though. the belt is lacking a buckle, but thats just nitpicking, really. i cant really tell the detail on the gun, but since i can tell that it IS a gun, thats really all you need. details are nice, but if you can get your point across, they really doesnt matter.
i dont see mich wrong with the second pic, just style issues, but since your style is pretty diff from mine i cant really say that its wrong, just different.
good job on both pics tho, hope to see more.