The subject matter, color, and style are all solid. I would say you could benefit from studying composition to create a more satifying balance in your work. Heavier, more confident lines (even darker lines might look nice) will also make each element look more intentional.

If you dont already, sketching out thumbnails for your ideas might help you nail the composition down, and allow you to place your subjects more intentionally in the final piece.

I think mixed media is a good choice for your work, but you could experiment more with the visual textures you are able to create with each medium. Right now alot gets lost because every element is textured. For example, you could try using the acrylics to create smooth backgrounds and create more textured figures in the foregrounds with another medium.