Very nice try at doing this very nice tho suggestion

next time you try this try and match the lighting of the image with the picture your drawing as the image you used is kinda flushed out so the fursona should look a bit whited out as well maybe with a lowered opacitied white layer over top only where you would erase where the back picture is and keep more of the white mask over the sona if that makes any sense
this is just an example http://www.furaffinity.net/full/7943049/ but i did it with this one for the buildings shadow over his character ^^

just a little tip thats all

:D