Easy for me to say
The green building industry is innovative. That means the technology has not yet been implemented, or only in a pilot project. That is usually a very specific building. Tricky to show to a new customer. He would rather see his own future plans depicted.
This is how simple illustrations work for project development.
What you want to talk about hasn’t been built yet, so if you want to show something you end up with a fictional building. And when you do have a fake building, draw it in such a way that your components can show their full potential.
Also, you can draw it in a way that it fits a specific audience, with specific needs. Handy!
Why not realistic 3D?
You can draw super-realistic 3D these days, but then you run into higher costs, and – much more importantly – everything is too precise. You want to leave everything you don’t know (yet) – or which is distracting anyway – out. You can’t do that with precise drawings. Therefore, a simple drawing style is best. The result looks nice and clear; it is obvious that it is fictional.
Easy to talk about, and that’s what’s needed in your first talks with a new client.