@griffin Hi Griffin,
the new studies are an improvement, but i think you have to define your light source clearer and work more on using light and shadow.
Maybe set up your local flat colors, define your light source, see which objects/which planes are being hit by light, which are in shadows, see how the local value interact with light and what the endproduct-values are.
See how you can design around your focal points. Design with 3 to 5 values for clearer image.
maybe something similar to this for overcast lighting?
1.flats
2.ambient lighting from window on top of flats