Hi there! I read your description. I can make this done in very short time!
I will need to use Photoshop to maskout part of building that need color change.
After that, i can place any color that oyu want ! I will do up to 10 color varations for this!
I think its fair, i checked attached image, and I can start working now!
I will use Wacom Tablet with Pen tool to achieve best posible results here!
I am available right now to work on this project, so I will start working as soon as you contact me!
I am expert in Photoshop and Illustrator. I working in these softwares for 10 years.
I can make free sample for you if you contact me.
I guarantee perfect result. I can start working as soon as you contact me. Available 24/7 for any assistance. I hope that we will work together.