My level I've made so far.
Screenshots:
http://bin.smwcentral.net/u/23136/MMPreview.JPG
http://bin.smwcentral.net/u/23136/MMPreview2.JPG
Download Link
Obviously, it is finished.
yczedit: a spoilered giant image still stretches the tables

I do find the palette dull if it is used like that. The level itself seems fine but it is best not to use the decoration like that (all over). Also it would be better if you linked such a large screenshot.

You may be right about the palletes. But it's supposed to be dark. I will remove some skulls. Thanks for the feedback. I will change the palletes, still I will keep it dark.

Your palette could have some colours, but you could still make it dark. Try some dark blue, green or brown to make the palette more interesting. Otherwise it's fine.

New pallete screenshot.
http://bin.smwcentral.net/u/23136/MMPreview3.JPG

It seems slightly improved though I would love it if there were varying shades there (not too much different but still noticeable enough).

I can make that, but I don't have enough Map16 tiles left. Is there any way I could do that without using Map16?

Looks pretty nice, but the white color stands out too much. I recommend changing it to a lighter shade of the same color instead, as I guess it would look better. It also seems that there are way too many decoration skulls in the ground, but that might be just me.

Other than that it looks fine, I guess. That grinder looks a bit hard to pass through when big, but that might be jus tthe screen.

Thanks for the feedback. Will change the "white" color.

You should almost never change the color of the coin blocks or the coins. It doesn't look right.