Because they're too 'heavy' files, limit is 10k for featuring on the front page.
They're heavy because in RVB mode, not indexed color. Change mode or save as gif.
(only valid for this one. The others, no idea)
@Rayovatron Ty!
Why my submissions are not being shown in the "New Pixel Art" showcase of the main page ):
(None of the last 3 submissions have been in there... and I've been checking like every 1 hour :D...)
@Manupix Thanks! I was clueless about that, I skipped reading the instructions when I submitted the piece...