Cool man, the model looks pretty solid in your renders with that texture and lighting.
Can you go more into detail about what your trying to show in the renders?
Are you wanting to show off the technical quality of the model? Is it meant to be a historically accurate recreation, like you might see in a museum?
I understand the camo is meant to break up the shape of the tank, but it might be hurting you in this case. Combine that with the flat lighting, and the small details are difficult to make out.
I think this would look better if you toned down the contrast on the camo, and maybe relit the model to a museum type of setup. Use harsher, more focused beams of light, and add a little more specularity to your surface. Try to get some nice large subtle highlights on the turret and hull, so the overall shape better stands out.