Unable to use my own sketches as structure reference in Firefly

[Jason24427496vsar]

My sketch of a bride unable to dance with her father at her wedding because he has hurt his foot as reference for structure layout is for some reason in violation of the user guidelines.
Please can you let me know what is in violation so I can move forward.

[Kevin Stohlmeyer]

Im guessing it was due to lack of contrast in the source image. It failed as is, then adjusted and it ran just fine.

"Frustrated bride sitting next to her father with sore ankle"

Describing the father would lend to this result but out of the gate, not bad.