Looking at a reference pic of a gorilla (not that hard to find) the anatomy looks just fine, but there are a couple points that might want attention. For example, if he stood on his back two feet, what would happen to his head? Without a neck, that might be a bit awkward. Might not be a huge issue though. Also, he does look a bit dog-like, but I think this is just because his back dosen't curve inwards. I would experiment and try to get a curve in it. If you sit up straight with good posture, your back curves inwards lower down, and on gorillas this is very pronounced. Your guy's pretty straight.
I think the limb length is okay, personally. I really love the scratched metal look, especially on the front arm. Nice colour use, too.