[Help] Someone Can Edit a model for me?

[Anknaton]

Hello there is the third post since my first about the Driders and Dark Elves... Now I need a different kind of help, I have got two models but I want to to change the head of one of them, someone can edit it?

They are based on Warhammer I tried myself to edit i but is a kinda hard to me because one of them has to much geosets... There's someone with more knowledge to edit my model?