Through trial & trial again, I've managed to finish my first image in Microsoft Paint!

Something doesn't seem to be right about it though. I'm betting it's both the perspective of some of the objects, but most importantly, the shading seems off. (Most particularly about the floor and urinals).
Would there be any way to make this seem a little more realistic?
Furthermore, what would you say is my skill in pixel drawing? I should understand, so I know what to further study when I attempt another drawing.

Something doesn't seem to be right about it though. I'm betting it's both the perspective of some of the objects, but most importantly, the shading seems off. (Most particularly about the floor and urinals).
Would there be any way to make this seem a little more realistic?
Furthermore, what would you say is my skill in pixel drawing? I should understand, so I know what to further study when I attempt another drawing.