FF6 style GBA adult Rydia

You should take a look at Lord Sutubenu's thread, it is loaded full of useful information:
https://www.ff6hacking.com/forums/showth...hp?tid=667

Aside from that, I also suggest you have an image editing program like Photoshop or Gimp. Gimp is pretty great because it is free and pretty straight-forward. You can use these to reduce your completed spritesheet palette to only 16 colours if you screw up somewhere along the way and accidentally go over 16.

If you have any other questions don't be too shy to ask, we're all here to help each other.