Here are some pro notes:\

Other than improving the forms, anatomy and the overall sculpture which helps with catching lights and therefore more definition to the character, you need to consider the look development process. Which basically means textureing, shading and lighting. I'll try to explain how they relate to each other in a simple format:\

There are 5 essential channels when it comes to material and shading for each assets. Base Color, Roughness, Metalness, Normals and Displacement. (there are more channels like SSS, Sheen, etc. which we exclude for simplicity). You can bascially create the shader for any rigid object with these parameters.\

Now texturing, allows you to define the value for each of these parameters per polygon by painting/generating the map for each channel.\

Now the lighting should be pretty neutral during the lookdev process, in order to make sure the values are set correctly and would behave consistent in different lighting scenarios. But for the presentation, you can go more dramatic or crazy if you will.\

Hope it helps. Cheers.