I think he looks pretty good, especially for a first time attempt at
OSL. You've got the light reflections in the right places but I think the intensity is a little too much. Especially up at his armpit and face. Remember that the reflected light (on his skin and rocks and whatnot) will always be less intense than the light source (your lava). And even less the further from the source you get (of course other factors effect this too). You could easily touch it up by making the farther reaches of the light a lil darker with some orange over that yellow? You could also lighten up some of the lava areas with a lil white to make it look extra white hot (this would help justify the yellow on the rocks)!

- Not flamed, just SMOKIN HOT! SSSSssssss!
All in all, a VERY good first attempt! Cheers!