Top secret
Tell me does this character look familiar to you?
Hellow.
Hmmm... Honestly there are thousands of black dragons on the community to be honest and I am unable to tracking them all, not to mention that per day people create 100 new dragon all around the world.
This dragon have circular shape horns and two additional following ones with middle size. The bone texture looks smooth. Her gaze give the vibe like (hard to guess that he is a dragon or dragoness so I guess that is she so I will pronounce that way) her Noble gaze judge coldly your pathetic being. Hard to guess her body shape only by headshot but probably this character have her own Reference Sheet.
My dragon character Agon Gabriel Zet have similar features but there are many meaningfull details. Like horn bone texture and shape. Another one is scar on the left eye that my OC have. Probably spikes too because I see only one on the neck your dragoness and mine character have spikes from the head to the tail blade. He is male dragon with slender build more femine like.
Art made by artist was created on canvas by prepared Reference Sheet describing physical features, personality and magic abilities that he use.
For some people all black dragons looks the same. In my personal experience those people lack of noticing key features that makes this Oryginal Characters unique. (Or author didn't give enough reference material for artist to work with or just picked up the cheapest less detailed option to draw).
I believe that both characters are entirely different and there are no point into discussion who is owner of which dragon.