I tried my hardest despite being new to gimp and rather terrible at manipulation ;-;
http://ravenswinglullaby.deviantart.com/#/d5m2vlt
That one of course has no stormy background like you wanted so I made this one~
http://ravenswinglullaby.deviantart.com/#/d5mw6rf
I hate the wings ;-; but the stock I wanted wouldn't allow horse manipulations with them. And I also have a version without the rain texture, if you find it too distracting.
I ALSO
Have two drawings for you <'3 however those are still coming as I need to photograph one, scan the other, and then upload them to here.
Plus my cat wrinkled one picture :< so very sad
I tried! I knew I couldn't do Bazilisk well so I didn't try lest he look terrible ^^;