I specialize in hand drawn sketches, in my profile's portfolio you can see what i am able to regarding architectural drawing, if the work is digital, it should be easier for me, so i im pretty confident about this project, i know i can do it, i consider myself an all rounded artist, and digitally watercolouring it, shouldn't represent a problem to me.
My bid is $150 CAD per illustration, since you mentioned 3 landscapes, my budget is 150x3 > 450 delivered in any size and format you need and of course we can arrange the price acording to your needs and the quantity of illustrations needed.
needless to say, my designs are subject to any changes that you need, we will be together in the creative process, salutes!