This is the variant cover to Age Of Ultron #10, spotlighting the first appearance of Angela in the Marvel Universe, now fully bought from Neil Gaiman.
I understand that it is basically the first panel of her story, it was from here that she was untimely ripped, then dropped in orbit around Mars, and yes those are Moombas created by Jack Kirby.
The head she is riding on in the double page spread is the head of the most aggressive Moomba on the wrap cover.
Where she is and why she is on a planet of Moomba has a lot to do with her origin as well as the origin of her fellow angels…
To Guardians Of The Galaxy #5, folks!