I'd like to use stock photos as source files to illustrate watercolor clipart. Is that an acceptable use under the extended license? I intend to sell the clipart I make from the reference stock photo and use it in printable art. The original file will not be apart of the end product.
Are you using the image as is or are you editing it first?
I will be editing the image. I don't intend to use the original file as is. I just want to use them to create clip art for surface patterns.