I couldn’t decide which one I liked better, so I picked both
The original from my deviantart:
It is acceptable to use my work for practice in the case of a sourced and credited master copy. You are also allowed to use my tutorials and techniques.
It is not acceptable to use a commissioned drawing as a base and call it your own. I don’t care how much you “changed” the image, it is still not yours. What kills me the most is that this is a commission, these are not my characters that have been tampered with. This commission wouldn’t be half as good without the scripts, ideas, and descriptions I was given by the client.
Maybe the op is young or unaware this is a nono but I want to nip this the bud right now by saying you do not do this to another artist. Especially on a commission, you make twice the people angry and it’s very disrespectful.