how to sketch architecture

this is a sketch of project done by the Universidad Iberoamericana near the border with the US to assist migrants by giving them training and by that maybe more possibilites to get integrated into the working places staying in its home country.
supplies used in this sketch:
linework: Pilot GTec C4 0.4, papermate flair M
color: AD Chartpack markers: cool grey 1,3,5,7,9,life red, light olive, nile green, grass green, olive, evergreen, azure, ice blue,
paper: marker paper marker pad .TOO B5