I choose to draw a tulip on the 4x6" of water colour paper. I then wen over the drawing with my finecolour multiliner, which is awesome by the way. It does a much, much better job than the copic multiliners.
After drawing with he multiliner I started working on the background with twinkling h2o colours and my water brush. The twinkling h2o odds a nice glimmer to the postcard. I finally adhered the water colour paper on a 4x6" card board and stamped a postcard alignment on the card board.
water colour paper
twnkling h2o ~ orange, green, purple, turquoise, blue, gold
finecolour multiliner 0.5 and 0.2
rubber stamp ~ postcard alignment
clear stamps ~ flowers, leaves