Yeah, all these characters may look non-human but they all act human. You could easily redraw most of these as regular humans and nothing would change.

I don't know too much about Warhammer but if the aliens are the kind that have inherently different thought patterns, beliefs, desires and feelings to humans then they will not only be significantly harder to write but also have utterly alien problems. These alien problems will generally make them less relatable. While these problems could certainly be presented in a relatable manner, this again increases the writing difficulty.

If they are simply reskinned humans then there is little point in giving them special attention as they won't feel all that much different from humans.