Angel

So this is my first digital art I suppose, I had no idea how to shade the hair though!
Any critique is welcome btw. I used this stock photo as a reference:pyjama-cake.deviantart.com/art…
 to improvement-club: I had a lot of trouble with giving the hair texture and shading it, even though I looked up tutorials. anything else that is ''off'' about my drawing is alright to correct too, of course!