Zhann, it looks like you got the rest covered. But for your shadow problem, the solution is pretty straightforward. It's the Ambience levels that are washing the shadows into oblivion. Try putting all of your "stone" textures into their own families, then lower the ambience, or equalize it throughout the scene. As a general rule, try using the exact same Ambience value on EVERY material in the scene. Except glasses, or glowing objects like fire. This alone probably won't fix your problem, the other end of it is tweaking the global shadow color/strength, and then your shadows will be fine! I mean the shadow strength/color that's represented by the second tile from the left in the Sky menu... Between those two, you should be able to pull off your deepening shadows.