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hi Lumination and thanks for your detailed reply.
my tattoo is on my upper arm.. a heart outline, made of very small flowers. it's about 2.5 inches high. the tattooist decided to add some shading, and that's where is all went wrong. it ended up a blurry mess. the flowers have been re-coloured several times in an attempt to make them look like flowers again, and the whole outline was re-tattooed with white ink to try to cover some of the shading.
the main flower in this new tattoo design would cover the whole current tattoo, the centre is current not tattooed so would allow for lighter central shading. the grey toned leaves would be on my "virgin" skin, lol ;o)
thanks again, I'm going to check out your recommendation x