Use it! I don't mind or care. I do not get on dA enough anyone to respond to inquiries about using my stuff in a timely manner so here's just a blanket "use it" statement.
I'd prefer for you not to use stuff that actually has my picture in it but other than that, let loose. If I remembered to cite the stock image providers for the manip you want to use, try contacting them to get permission - but a lot of the time early on in my gallery I forgot to credit stock providers, and a lot of the ones I did credit are no longer active of dA. But you, whoever you are, have permission to use my stuff. Wherever. Have fun!
I am very sorry to bother you, but, what is the name of the character in your avatar and what series is he/she from? I recognize the character from a long time ago, but I forgot the character's name and what series the character is from.