That's exactly what I was looking for, thanks.

I'm aiming to make them usable for printing or VTT, but mostly just playing for the moment. So long as they look god on my screen, they will be fine if I need them.

On the upper floor, the left is darker as I used a black-soft lighted on the floor area to try for the effect of the floor being lower there....

That is probably also what's emphasising the shadows.

I'll take that out I think, and play with longer shadows on that area instead, and then have a play with the walls...