I use to have this as a wallpaper. Great to see a sketch of one of my favourite pieces. I am no artist but would critique that you have given the wings not the same attention as the body and the beautiful shading you did on it.

I zoomed it and it feels truly as though he is emblazoned onto the paper. It looks great because of of that texture although you could have made the necklace lines and smaller details as hard as you did on the wings which as mentioned I think can do with the shading you used on the body. Hope to see more.