AT-ST Model

This is a project I started about two weeks ago. I'm modeling an AT-ST (From the Star Wars universe) in Maya. AT-ST stands for All Terrain Scout Transport, and it's a 2-legged vehicle, armed with laser cannons and a few missiles. You see these vehicles in ' Empire Strikes Back ' during the Hoth Battle scene and in ' Return of the Jedi '. I haven't finished the model yet but this is a picture of what I have created so far.

I have somewhat completed the model, but I am not completely satisfied by it. I feel like it needs more detail to give it some more life. I haven't textured it yet and it definitely needs a nice layered texture for that rough dirty metal look.

I tried 2 renders with the model - One in standard lighting and the other with a physical sun and sky based lighting. The 2nd one makes the model look like its made out of plaster, and that is definitely not the effect I intended. The first render though is close to the effect I'm trying to achieve.

Another issue is that the head of the AT-ST looks very disproportionate to its legs. I'll have to make it a bit smaller. It does look a little comical now, almost like a caricature and it would work well for a nice cute Star Wars themed cartoon but I'm trying to achieve a more realistic look, much closer to what is seen in the films.