The outer silhouette is clearly from the New 52 bust for Vic Stone, but the inner shadow of him catching a football I'm guessing is from the first issue of Justice League.
Here's some links to his stuff on the this here internet:
Oh! Speaking of the crossover, check out my comrades in blogging and their pieces on Garcia's work:
Then there are some previously posted pieces of Mr. Garcia's featuring the following:
Booster Gold, Martian Manhunter, Wonder Woman, Hawkgirl, Wonder Girl, Zatanna, Black Lantern, Martian Manhunter, The Atom and Captain Marvel.
Check them all out. Come back and let me know what you think. Or maybe sound off on the new blogs after clicking through. Enjoy!