Prison Cell Cave Problem

[SinSin]

I'm having some problems with this ive done a few drawings of this cell but i cant seem to get it right
I have supplied the basic image but it doesnt look right at all, It is the right scale in comparisson with the character but I cannot get the room to look right
Also it must fit with this scheme
Here

[cobra79]

Well at the moment it does not look like a cell, nor a cave. A cell normally has at least a bed and some bars.
But that alone would make it look like some underground gestapo facility.
If it is supposed to look more modern add a bared window, a toilet, a wardrobe, pin up girls on the walls etc.
A rushed sketch to give you some ideas.

[Khris]

And remember: all parallel lines meet in the vanishing point. The upper line of the door doesn't yet.

Edit: It does indeed. Guess the lines on the back wall tricked my eye.

[Medical Waste]

Yes it does.