CGMythology, you have a number of perspective problems going on.
The top step roughly follows the perspective of the floor, so that would place the horizon at approximately the top of the vase/pot on the left of the image, but each of the other steps leading up to the throne all have different vanishing points further below that.
The column on the right is also confusing. The base is perfectly flat suggesting we are looking directly at it, yet it is far below the horizon so we should be looking down at it. At the same time the top of the column that we should be looking up at (as it is above the horizon) is angled toward us. As it has something on top of it I would assume it should be horizontal, but the perspective would make it angled and the items on top of it would likely fall off.
With the eye level where it is we should be looking up at Pluto instead of straight on as you have him (it also looks like we are seeing the top of the arm rests of the throne when we should be below them).
Also, the thing hanging down from his belt between his legs is perfectly vertical and flat instead of following the curvature of his thighs which gives the legs no dimensionality or depth. I would suggest having it drape more around his legs.
Hope you don't mind me scribbling on you image to help explain what I'm talking about.