I've spent a couple of hours fooling around with GIMP. I'm no expert (and it should have a non-linear perspective transform, but does not).
Now, as to why I did this and that. Part of my rationale comes from what I see on covercritics.com.
I've made Tommy bigger. I've put an open-book icon on his back (grabbed off the web-your artist will have to make his own). No, it's not something in the story, but it's an indication to the reader of Tommy's special powers.
I've tried to move Tommy closer to the reader, and to move the danger closer to him. I've done a very clumsy two-stage perspective wrap. I've given him a little more room, and moved him a little off center so that he's looking through the center in his confrontation with the danger. You could move him a bit further to the left.
I would also have Tommy looking straight out at the danger, not down.
The extra arm is a failure of my editing ... but I don't want to spend another two hours on fixing it. You can see the idea.
HopeThisHelps.