I have received many requests for permission to use my artwork. Here is my general policy on that.
You may use the images currently on my site for non-profit, personal use. (That means that there may come a day when I create images I will not grant permission to use, even if it is for non-profit, personal use.)
A link to my site on the image (or on your site or in your group) is optional. (I'm told this is important with MSN groups.) All that is required is that my copyright appear on the image itself. (Please note the spelling. Some people get it wrong.)
People have asked about such things as tubing and adding sparkles. That is fine. See item #2 below.
There are three things in particular that I do not allow without explicit, written permission. (These are the only things that have come up. There could be more in the future if the need arises.)
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I do not grant (and have never granted) permission to create an archive of all or part of my work. That is, the originals are to appear on my site only. (An exception to that would be showing one of my original images in the context of a tutorial.)
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When you alter my work, it must be clear that an alteration has been made. So, for example, since I don't use sparkles, any image that has sparkles is clearly not the original. Changing the background is also OK.
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In contrast to #2, I do not permit subtle changes to the figure in the image, such as changes in the color of eye, hair or outfits.
The vast majority of requests I have received are from PSP groups, and for the usage requested in those cases, all three of these points are moot. People want to change the background, add sparkles, and make all sorts of creative embellishments. That is fine, because it draws a clear line between the original art and the modified version.
If you have questions about this, feel free to write for clarification.