This is sort of an AKI style right? It looks simple but thats not a bad thing at all. It would be cool if you used the hard mix blending option to add that 16-bit texture style detail. I personally thing the tables, ladders, and chairs look blurry.
Try drawing the psd at a higher resolution and then scaling the final down. It could do well to be sharper. I haven't seen this ppv to really give any tips to make it more accurate or anything.