We're going down small steps, now its 2208. I don't know what the effects are that make this so colorful, but visually it looks like it should have about 32 colors!

Still 2645, way too many!

I'll make some revisions, thank you.

nice design
but 4541 colors is way too much for any Pixel art piece
which suggests that it has Non-Pixel art elements
such as gradients (on the rust/grime on the roof) and blur/smudge tool which is present around the bottom half of the ship as well the shading of the pipe