Told you I'd post it! You all doubted me, but you're all WRONG! Now give me your lunch money.

As with all pirate flags, Sheila's flag has multiple symbols detailing just how badly she's going to ransack your ship. The blue circle means that she will not kill anyone (if you surrender quickly, that is). The black bird is a magpie, a bird well-known for stealing shiny and valuable objects. The sword at the bottom demonstrates that she will use force whenever deemed necessary. The yellow circles of course are gold doubloons.

As for my signature in the corner... that's not actually part of the flag, I put that on all my drawings.