Commission Pricing is dependent on the number of scenarios requested and size of the requested piece. Below are ballpark prices:
9x12 - $350 (about 9-12 images)
12x18" - $750 (about 12-16 images)
16x20" - $1,000 (about 16-20 images)
20x20" - $1,250 (about 20-24 images)
24x36" - $2,000 (about 36-42 images)
Should you want to move forward, I provide you a google doc that you fill out - names of places, photos, stories (they help me bring the drawing to life). 
For an additional $75, I scan it and make an additional copy for insurance. 
I require 3 weeks leadtime to finish the project. 

Email me to move forward