You need to make the legs thinner and have another visible joint. (take a look at basi/mara/goon/rant model with /devmap atcs, /g_alienstage 2, /give funds 9, /cg_thirdperson 1)
There shouldn't be polys connecting the higher tip of the legs with the body.
The legs should be a bit tilted not straight.
The body is too high off the ground compared to other aliens.
The hands should be redone. If you really want several claws, they should be side by side. They also shouldn't come out the front of the body.
Polys/quads on the head should be split along the middle of the head to make it less boxy.
/constructive criticism
not to be a dick or anything, but it's fucking terrible. scrap it and start again.
Do you think this is supposed to be 1.2 tyrant replacement or something? It's his first time modeling and for that it's good.