As a morpher, I'll tell you my opinion.
When I take a pic in the net and I work on it, I consider that pic not to be any longer what it was before. It becomes "my" morph. I worked on it (both on the breast measure and on colors, lights, etc...). So if you take my morph and work on it, it is no longer "my" morph, it is your re-edit. Delete my logo if you changed the morph very much, or make it clear that this is your re-edit and not my original morph. As well as I do when I stick my logo on a morph, to sign that this is not the original pic.
Now the point could be: how much are you retouching my morph? I mean, if you only work a "little, little, little" on lights or colors, or you enhance the girl by a mere centimeter...then you claim that it is your work....well, that's cheating and stealing. If you do so, please stick your logo but leave mine there so people could know that probably great part of the effort was mine. If, on the contrary, you are working a lot to change what I did, as I said before, that's your work, that becomes your morph, and you decide either to leave my logo on (but making clear that you passed it under your hands) or you cancel it.
Blax12