Appreciate the Dark Side? That's certainly an unexpected statement. Knowing one's enemy makes sense as well, except that one probably shouldn't become one's enemy to do that. That sounds like a recipe to cause all sorts of problems for one's self. I bet Luke is actually warning Rey about the Dark Side in the movie and how it's tempting, but will cause all kinds of problems.

That's an odd picture of the hands I have to say. If either the comic or my guess is accurate to the movie, I don't know why that would be included. Perhaps it's sort of like training wheels? Movie Luke might be able to tell that Rey has the potential for using the Force, but not the courage or something to use it whenever. So he'll levitate the rock, tell her what to do to do it herself, and just stop to let Rey find she's holding herself up. And then possibly drop the rock right after if the movie needs a bit of levity.

And for true villainy, I'm pretty sure hair, big or small, isn't necessary. I'm also pretty sure biology isn't necessary either. Though since technically Nute did start out as a biological being, perhaps that's needed at some point.