Hunting a story - could you please help?

A year or so ago I read a brilliant story... and I can't remember it. Could anyone help me remember where it is please?

A young boy is a talented artist attending a catholic school. His family however are not very supportive of his talent.
He enters a statewide talent contest having forged his parents approval and gets through the preliminary round. The only problem is his covert
alter ego is a girl.

Her winning art series is based on the 'manners of death'

If you could help it would be very much appreciated. Thank you

Persephone