. . . trying to avoid that "photoshopy look" if you know what I mean . . .
No, what is the "Photoshoppy look"? Most concept artists use PS based on what I've seen. Are you aware of Photoshop's new media brushes?
But it sounds like you're having a style choice crisis. Bold outlines wouldn't be bad move I don't think. Though, you'll be moving further away from rough oil paint looking stuff and more towards cartoon/comic as a result, probably. The blending of basic styles is always possible, though doesn't always work.
And made me think of
this, for reference. Kind of a joke . . .
The cat really bugs me. Looks like you found a reference photo, painted over it, then awkwardly turned it 90° to make it look like it's a cute sprawling kitten, whereas it looks like it's actually from a photo of a cat jumping up on its hing legs swatting at something.
A small composition suggestion - change the horns to be smaller and not exceed the canvas. Why give the eye something to trail away
out of your image?
Facial expressions are so hard, but I don't really interpret his as fear. More so, it seems like he's in shock that his pet cat has fallen down and he's worried it's hurt itself. Like an old lady. An old cat lady.
Lighting - pretty omni-lit scene here. Have you thought about
classic horror lighting? No, I don't think you have. But I think you have now. What do you think? How about a green light source? That's an even bigger tip of the hat to classic horror. Could be kewl . . .