Hi
It can be done but… (aint there always)
White ink i s really sucky at staying in the skin and can fade within 18 mths – 3 years it would be a constant battle to keep the lillies ‘white’.
That said if you didnt mind a compromise on the colour yes with a good artist it can be achieved. If you wanted the blurred affect similar to the water colour it would be some very intense shading.
The only issue to watch for would be blurring with age.
Nice concept though.
Matthew