Super cool design, and great modeling/textures! I feel a big inspiration/reminiscence of DOOM's arachnotron
Model and design are good but I think that the textures are too noisy overall. Have some flatter/simpler areas of texture to provide some visual resting points.Your current lighting setup is flattening the image as well. Try a simple 3 light combo - fill light (usually skybox, HDRI image with exposure tweaks), a rim light and a key light.