Hi there,
I'm so happy I found your call on time. I love the story idea and I'm particularly delighted with the fact that you are looking for watercolour illustrations. I have done several children's books in watercolours and I can freely say I enjoy that medium the most. I'm a traditionally trained artist and I've been doing children's books illustrations for a very long time.
You can see samples of my work at https://www.freelancer.com/u/ddimitrovska?w=f. As for the process of work, after I read the story I would develop a storyboard, design the characters (following the pictures you'd provide) and draft the scenes in pencil. In this phase unlimited revisions would be possible and even invited, as we would need to be perfectly happy with the plan before I proceed with painting, since with watercolours it is very hard to make revisions afterwards. I could either deliver digital files (high res scans of the illustrations) or send the originals (please note that postal expenses are not included in the quote, though). We can also discuss producing a completed print ready book, including layout and design if you like.
The quote would cover for up to 15 one page full bleed full colour illustrations in watercolours, done on high quality paper.
Please contact me if you are interersted. I'd be very happy to hear from you.
Best,
Dusica