So far the project is really pleasant to do, considering that I always looked at environmental drawing as something Bad and boring. I think I might even start liking it and make some landscape drawings for my personal collection : D
The struggle with correct perspective and giving.. volume to the thumbnails is still hard to do. Exercises Must Be Done! Also drawing a perfectly straight line (frames) or keeping the thumbnail in horizontal or vertical way also seems to be an issue, but there is a solution to every problem - a ruler!