This is really nice! Your overall composition is good, you colors are working well, and everything is very nicely clean and polished. Very nice work!
If you want to take your work to the next level, I would recommend going backwards and hitting your fundamentals really hard. Your finishing and rendering skills are already pretty solid, but the image is falling apart a little bit in the drawing (the figure drawing, portraiture, perspective, etc.) So my advice would be to take some time out and do fewer finished images and hit your studies really hardcore, if you can find a place nearby that does life drawing that would be really helpful, and work on all your basic fundamentalss: figure, gesture, perspective, composition, design, texture, light and color, all that stuff.
Like I said, I think your finishing skills are in a good spot, if you can bring your drawing and composition up to the same level as your rendering, I think you'll be in business!