I personally like your first composition better. The head on completely symmetrical thing is rather flat. Just something to think about. You're drawing skills are GREAT :)
Love the composition and design of the latest. I also like the second idea too though, and I think the idea of Mega Gnar being scared also works out really well, showing that they're connected and adds a bit of humor, as well as connecting with the viewer by adding a bit more 'aww' to the piece.
The expressions seem more clear in the second drawing: the fact that little Gnar is scared, and Mega Gnar comes out even though it's just a jack in the box. Maybe you can try to incorporate the poses and expressions from the second one into the composition of the first one. At the moment, in the first one it just looks…