OK i must say that i LOVE this picture.
I like the fact that when you see it after some seconds you now is Lana del Rey but it doesn't have that photorealistic feeling.
Her face proportions are just perfect.
I think you did a great job with the shadows and the background doesn't look of even thought you put a lot of color in the drawing.
I must say that i like the details of the stars in her face and the one tear falling from her eye is an amazing detail!!
I must say that i have some doubt for the hand, but is really well done and doesnn't look at the least bit off!!
To sum up your drawing is amazing and you should fell pround you made it!!