How did I get into this, you know I haven't released a set for many years right?

Looked at the program, and I highly doubt that a 3D package provides pixel-by-pixel drawing and palette modification so I see no reason to use it for tileset creation. I firmly believe that the only way to make a good tileset is using the above method (Agama, Blade). Have made a tileset like that before though, Metal Mania I think it was called with a bunch of gray pipes, rendered the whole set in 3D Max instead of drawing it so it's possible.

Also, MSPaint does not in any way provide all the tools you need for tileset creation, but it does mean that you're on the right mindset in the way that you want to create tilesets