You are correct on both counts -
Use markers for coloring in, using several colors, one for the stems and another one, two, or three for the flower. Then blend the flower part just a bit with a blender pen or aquapainter, huff on the image and then stamp.
Also spritzing a fine mist from a spray bottle onto your stamp after you color it gives that fuzzy, soft watercolor effect that bleeds into the paper look.
HTH,
Valerie
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