Class final project

This is my first class, it's super casual, and we're finishing our final projects this week. I'll have time in class to refine my drawing with my teacher's input. I'm proud of what I have so far, but I'm struggling with getting the textures right. It might be that I don't have the right tools or maybe I don't know how to use the ones I have properly. I'm working with a set of soft and hard pencils, a soft eraser and a blending eraser, and a stick blender. Input and advice appreciated, thanks :)