I'm honored if people can use my photos as a reference, it's really awesome to see what people can do! I've encountered some odd situations though these last couple of months, so unfortunately it seems necessary to make some specific statements.
These rules are for all my photos. I don't mind them being used as a reference for a drawing or painting, as long as:
...you give credit by giving a link to the dA page of the picture of mine which you used, where you post your image.
...you don't use the drawing or painting for commercial purposes, without asking me.
...you don't change the concept of it too much: I actually don't mind in nearly all cases but I do in some (obviously 'odd' ones), ask me for permission if you're not sure about this point.
...you don't use the picture for which you used my photo as a reference for (site, book, cd) lay-outs etcetera. Ask me for permission first if you wanted to do this.
Just to be sure as some people don't seem to understand: when you manipulate the original picture, by simply smudging it for example, that is NOT using a photo as a reference. That is photomanipulation. I do not give permission for that.
Ok, that should cover it I hope... If you have questions feel free to note me
Have a nice day!