this is nice, , good pencil skills :> but to make your posts absolutely safe, you should always cite your sources. I think this is the original for your pic? https://www.deviantart.com/madeleineink/art/Medusa-287406003
people can easily find that the idea and design for this piece with a reverse image google search. and it's better to be up front with these kinds of things to avoid people questioning later on.
good luck with the contest !
RE: ART EXPLOSION WEEK 43: MEDUSA, pencil drawing process step by step