I'd tweak their stances a bit to look more like they're hurrying,skipping,dancing forwards. They look a bit static just now. I agree about the expressions; eager smiles or wonderment would reinforce your premise more. perhaps lift one or both of the fairies off the ground & pose her (them?) more horizontally as if flitting ahead sink the boy-figure into the snow as a more mundane creature, he'd be more subject to gravity. Add footprints in the snow. Might consider having the fairies link hands with the boy as if they're helping him hurry thru the snow (just be careful to angle him forward so he doesn't look like he's fighting it:-)). Possibly add a golden glow in their faces from ahead? Beaughtiful scene! Like the lighting & use of sparkles!