Grzegorz Wróbel is an architectural designer from Poland. He paints street scenes and, as you might expect, architectural subjects, in beautiful crisp watercolor paintings.
He evidently developed a drawing and watercolor style for the purpose of architectural presentation, but also engages in watercolor painting of existing scenes, either for his own satisfaction or as gallery art.
Wróbel has a deft command of his medium, painting with clear, fresh color, a beautifully handled mixture of sharp and blurred edges, wonderful applications of subtle texture, and a solid grounding of draftsmanship and composition.
Wróbel knows how to draw the line (so to speak) between too much rendering and just enough, precise drawing and loose interpretation. He has keen eye for selecting the most important elements in an architectural scene and emphasizing those, while producing an overall composition alive with appealing color and value transitions.
For a quick introduction, see this article on Empty Kingdom, which is where I discovered Wróbel. It features several of his images reproduced fairly large.
For more see the extensive galleries on Wróbel’s deviantART page, which apparently serves as his website. There you will find, in addition to his townscapes and street scenes (many of which are linked to larger versions), more traditional landscapes, a few fantasy subjects, figurative work and even paintings of monster trucks.
There are a couple of step-by-step walkthroughs that give some idea of his technique.