Some days ago, i'm creating Hieroglyphs of Rex to my world, Cave of Rexeroglyphs. I'm only have a editor of images, called Paint. I make my Hieroglyph, and i test in my Hub. The only format that SMBX accept is GIF, but if i put the image in gif, the image turn in a very very very very VERY Bad Quality.
When i save in GIF:

When i save in PNG:

Remember: I'm utilizing Paint.