I don't know if it's okay to base the Zentangle within and around another image or if the rules are, sticking to a line scribble shape and making this into a design.
My basic shape was inspired by an oriental exotic bird image, then I added a "planned scribble" shape so it grew a big flower tail, then a leaf and a fan shape appeared as I doodled away.
I'm not sure if this is okay, I have seen tangle done within a stamped image so I thought I might get away with this. If you know there are rules, please let me know what they are.
I liked my exotic tangled bird anyway, so here he is.