Note: I moved your thread to the mentee forum where it belongs. Please remember to read the stickies before posting.
As for the image itself, I think you're falling into the trap of coloring and adding details too soon. You don't really seem to have a good grasp of the volume of the person or how the shapes and contours of the body work in 3D. Until you get a solid foundation, trying to color is gonna be an uphill battle. And in my opinion, not entirely worth your time.
Though this is not the advice you probably want to hear, I think you should go back to basics and work on your sketching skills. Try drawing from life a bit more and do some work in black and white. Charcoal or pencils work well for this. If you do really strong work in black and white, coloring will come much naturally to you.
What to draw? Try drawing simple 3D shapes from around your room. Try varying the lighting a bit and seeing what changes. Try a self-portrait in the mirror. Try drawing your hands... etc. The detail work and the colors will come in time so for now, don't worry about them. Focus on the image as a whole.
Any questions, feel free to ask. If you need a few good resources or books, let me know. I've got plenty to share if you're interested.
Edit:
Your goal right now should be to learn how to make a strong B&W image. If you grayscale out your work, it should still be just as strong as if it were in color.
As an example, take a look at this image. Notice how her coat blends into the background? This is the kind of thing you avoid when you work in grayscale first and worry about color later.