Help with cave like sceen

[SinSin]

Can anyone help me with the lighting on this pic please i cant seem to get it just right i havent been drawing long but i know about making things 3d and effective shading but this has me licked



here is my second shite edit

[Raider]

Not sure what you wanted but heres a quick basic paintover...

[stuh505]

There's just not enough detail in this picture to even make comments yet.  I can't tell if the red square is supposed to be a vertical wall or a floor.  Oh...I think it is a wall connected to the brown wall above it?  This must be a bridge of some kind crossing a moat to a castle?