Bookcover drawing

This is my drawing of the cover I want my book to have. As you can see it will be set in a wooded area with someone wearing a black cloak. On the tree there is a carving of a pentagram covered in blood, obviously I'm wouldn't be aloud to actually carve anything into the tree so it'll be ever photoshop or crafted. 

My reason for this cover is because it has a purpose in the story, It's the source to a mystery.

I've got an area in minds, the only thing is I don't have a cloak, so I might need to either borrow one o buy one.