In my opinion, it looks like he-who-must-not-be-named is holding his hand out like he was saying stop rather than reaching for something. Maybe something is comming at him and he's holding his hand out to stop it or whatever. As for the matter of the shadows in the background, I believe the to be either part of the order, OR maybe deatheaters, OR Dead souls from behind the curtain.
I dont know, but forsome reason why the orange sky makes me think of Phawks. (OMg i am so sorry I spelled it wrong). I am a bit confused about the thing around harry's neck, but by looking at the cover of the adult version it appears to be the locket of salazar, so I am led to believe that harry has one of H-W-M-N-B-N's horcruxes around his neck. Maybe he found that it rotects him, because maybe to kill Harry, He-who-must-not-be-named would have to destroy one of his Horcruxes. But then I think, that shouldn't be a problem for him because if he should succeed at killing Harry he could just make more, unless that one is somehow more powerful. Of course I could be taking this in a different direction. I mean it might not even be the locket. (But if it is, maybe it gives harry more power that he will need to defeat HIM.