Wow, that's really good! I'd already been making my own one. (Also that Cutie Mark has to be purple, Ashmodeus's one is Red.)
http://shadowdragon6060.deviantart.com/art/Anthro-Shadow-Dragon-571785747?ga_submit_new=10%253A1447447272&ga_type=edit&ga_changes=1I'd already thought I fixed it, but... I might go change the background to black. Would that be ripping you off?