This is a page from the webcomic Gunnerkrigg Court by Tom Siddell. Overall this comic has better art than many of the webcomics I’ve seen, and pages like this one is where the artist adds even more detail. But what I like best about it is how the character’s hair is used to make up the comic’s panels. It’s quite creative, and I haven’t seen it used before.
I like the soft shading on the girl’s face, and the kind of smudgy grey coloring in the picture and the way it contrasts with the hair, which is straighter and has much brighter coloring. In terms of techniques used in this picture, it seems to be the smudge tool to merge the grey and black in the background, and the pen tool in Photoshop to add detail to the hair. The detail on the gem in the upper left hand corner of the picture is rather impressive, and seems to have the most realistic look of anything else in the comic page.
I found this comic while on T.V. Troupes and Idioms.com, and managed to navigate to a link that brought me to Gunnerkrigg Court.