I think your new house is giving your photos a great edge, personally I find the lighting mix much more interesting than your kitchen, and judging from the fun I'm seeing in your photo shoots, you seem to be enjoying it too.
One thought to achieve the type of image you're looking for, try tilting the head down and keeping his arms closer to his sides. Based on how Joker approaches Batman after he crashes the Batpod, I imagine Joker would approach someone to cut them like that sort of like a quiet, stalking animal. Not gesturing his next move, almost hiding it, face down, eyes just looking up to keep them locked on his prey, knife out but not flashed to hide when and where the attack is coming from, and almost conveying a passive attitude in his stride, like maybe he's not coming to slit your throat.