Hi terrikon, welcome :). Thanks for revising the color count! It's nice work!
However, it was also sent back because of the very rough work. A lot of pixels sem to be placed in a scribbly manner, which makes it unsuitable for the gallery and explains the low score it got in the queue.
It is surely a lot of work to refine every single pixel on a work in this scale, but if you're interested feel free to take this to the WIP forum and we'll help explain how to clean this up, making it pixel perfect :)
3000+ colors... It's a great piece, but it's unlikely to be allowed into the public gallery until it's revised.
Thanks for the clarifications. I'm new to this