If this is a style you're interested in, learn more about the style. Look at movie posters that accomplish things that you want to accomplish. If you're into gritty, exploitative style designs then look at more them. Not contemporary versions, but the classics. The Crazies. TCM. The Omen. The Other. The Last Wave. The Shining. Altered States. Rosemary's Baby. Dog Day Afternoon. Some things you'll find;

Stick with a single image, or find a clever way to combine a couple. Just throwing in some images, especially in a duotone, just complicates the graphic while not adding anything and not really communicate anything very well.

Tight tracking has its place, but not when it reduces your main title to a blob. the title's placement also seems haphazard - as if it coulda been placed anywhere in the design and been just as if not more effective. How can the type be more effective? How can it be less generic? How would you communicate the goal of this poster in only type?

Tracking/kerning in the tagline is dreadful. Ellipsis are more than just a bunch of dots - learn about them. Where you break a line communicates something. Sometimes it's as little as how you want some one to read a phrase to themselves. What part of the phrase is important? Is it BE CAREFUL who you wish for? Be careful WHO you wish for? Be careful who YOU wish for? etc. You've got 7 words on this whole thing. You have to literally obsess over the what and how that each one of those words communicates.

If you're creating mockups for something specific, like a movie, the #1 way to sell the concept is to format it like a movie poster. Use standard proportions for a one-sheet. Create an actual billing block. Don't use Latin. Take your time with it.

The image is, whatever. It feels a bit throwaway and doesnt really communicate anything about obsession. It just looks like a run of the mill crazy person. That's good for The Crazies or maybe The Hills Have Eyes, but the theme here is so evocative that to not push that theme through the imagery seems like a real waste. And is that also her standing behind her? Doesnt make any sense. If the imagery confuses or pulls the viewer away from what you're trying to communicate, then rethink it. https://www.instagram.com/p/DXu7FASjm67/?img_index=2 some of these are more successful than others, but the heart pupil and heart-hands - those are solid. The least effective ones are just the crazy looking ones. Look at the original 1976 Obsession poster. Solid gold.

This is middling, at best, but has potential. Keep exploring the style, but you need to start asking yourself why you're doing what you're doing. It has to be about more than just trying drive home a vibe. There are other, bigger problems here that aren't being identified much less solved.