It's a bit early to have much of an opinion. I think you have a cute art style. I really like how you add color in as accents.
Small question: is this comic going to remain in mostly black and white or switch to full color ala Wizard of Oz style? I ask because seeing a comic titled "Watercolour" and then clicking on it to see mostly black and white pages is a bit of a jarring experience. (Though if you continue using color as accents I think that'd be a pretty neat effect.)
(Not that there's anything wrong with black and white. Some of my favorite comics of all time are monochromatic.)