Hi Lilliane,

You can certainly reply in the comment list, but due to the large number of images posted, your commentors seldom will return to that image again unless they particularly love it.  Most people either use a thank you under the posting for that image, or thanks for comments on previous images, or they will use Site Mail to address individual commentors.

Most fractal artists don't give merchant credits because they don't use any merchandise, lol.  We will often list the software we use or even the formulae we use.  We acknowledge allowed tweaks of other people's work where appropriate.  If you do use something as an accessory to your fractal, such as a frame, and wish to give credit, you are certainly welcome to list it.  If you are using a beginner flame and building on it you might want to give credit to the originator.

I hope that helps!

~Vivian

Fractals will always amaze me!