You got such colorful pop and much contrast going. Looking good.

On your next attempt why not try putting a big shape of color of a background? Who knows maybe someone well use that as a killer flag.

Or better yet look up online animal bones with ribs and wings for better details.
Bony bats wings. Hollow snake ribs. Bird feet, talons claws all kinds of goring stuff.

You got such fearsome looking beast. Keep at it!