Still too much filtering for me. The image is maxed out in colors xD
edit: Quick color reduction/tweaking (6 colors, compared to full 256 used by OP)
Contrast is a little high, it's whatever. I think the problem is you're using filters to create detail causing it to have that 'plastic' effect mention in above post. Not even sure if this is intended for Graal/supposed to be pixel art (dunno if you mentioned so) but filters are a bad choice if you're trying to pixel.