with your permission i would like to copy the composition, i have created a effect that deals with bubbles and i really like your composition, i would like to copy it if that is ok, do i have to credit you?
well in all honesty, you can't be serious?! No artist wants anybody to copy his artwork, not even the composition. On the other hand, what's the point of "art" if you copy other artists' work entirely? And now don't tell me that it's only the composition; if you knew how Keid did the effects, you would have copied them as well, since you even asked him for tutorials. Probably the most awkward thing about this whole situation is that you ask him for permission to copy his artwork and when he denies, you still do it. That's simply unacceptable.