Design A sci -fi environment with Color

Firstly I am looking for some one who can work in following manner : 1) Will show the proper portfolio related work 2) My budget is low... and need quick turnaround 3) Will show me drawing sketch first...will give changes one that...after making changes when it is approved then will do the color....Again after coloring will give the changes needed...ad finally project will be finished when that is approved 4) Project payment will be done in 2 parts : a) First : when drawing is approved with changes b) Second : when Coloring is approved with changes Here is the details about the BG : We need 25 rooms sci -fi environment , door openings should be of the same size in every room There doesn't need to be any roof as it will be a top-down game, there should be some props on the scene such as computers, screens, tables, and such, but I want to auto generate those, so they should only be done once. Best Of Luck