I tried different palettes but the creature is still losing a lot of details.
I have a couple of questions:

1) How to create a specific palette for this creature and apply it to eliminate weird colors?
2) From a VCMI guide it says that Heroes is using the 8BPP palette, but when I select it I get errors in Photoshop. It says:
"Must be between 000000 and FFFFFF. The closest value will be choosen" then it sticks to 000000, so it has no effect.
3) Is it possible to import those very colored creatures without 3DSmax (I can't activate it) or I better stick at simpler ones when using Photoshop?