Painting with a camera

Here's my 1st attempt at a watercolor effect with a camera. These are actually blossoming trees in Yuanmingyuan 圆明园.

To make this effect I set the shutter speed at 1/5s and panned the camera vertically, trying not to make any horizontal movements. I wanted to keep the lines of the tree branches in tact.

Here's a pic of the actual trees.