Quote Originally Posted by RPGMarshal View Post
Since it would be for creation and imaginary worlds, and that I don't have the possibility to take top-down pictures, I will not consider this way even if it sounds fun and effective for a photographer with a good camera.
You don't need a good camera. Your phone camera will do, and you then have the reference photo when you decide to draw an asset. Otherwise I think 3D or vector is the way to go. I usually use 3D when I'm doing non-photo based assets now, and 3D and photo alike to reference for raster drawing style.