skull and crossbones clip art

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Arizona Clip Art at Clker.com - vector clip art online ...
Simple Cross Clip Art at Clker.com - vector clip art ...
Cross Clip Art at Clker.com - vector clip art online ...

Wikipedia results

1.List of Batman family enemies

Takes on Ubu in new clip". Den of Geek. "’Son of Batman’ review". Batman-News. "How about a look at Frank Quitely’s cover to BATMAN AND ROBIN #6?". DC Comics

https://en.wikipedia.org/wiki/List of Batman family enemies

2.Sinister Six

the Superior Sinister Six with Kraven, Scorpion, and a mind-controlled Vulture, Rhino, and Crossbones mutated into a new Lizard to eliminate Spider-Man

https://en.wikipedia.org/wiki/Sinister Six