Hi there,
I just saw your call and checked the reference illustrations, and I would like to express my interest to work on the third book of your series. I like the simple style you are after and I can can very closely copy it in pen and ink, with watercolours for the cover, as I'm a traditionally educated old-school artist specialized in pen and ink drawings. You can see some of my recent work at https://www.freelancer.com/u/ddimitrovska.html, but I can send more appropriate samples in a private message (as it is not possible to attach something to a bid). Also, I'd gladly prepare a sample illustration which could be included in the package should it meet your standards. My quote would cover for 10 black and white illustrations and 1 colour illustration for the cover. I'm available to discuss details over chat and I would be very happy to hear from you soon.