Hey, Leonid, thanks for posting this! I really like the buildings--and I'd be interested to know how you achieved them in SketchUp (so I can copy you
I also like the compass rose's colors alternating with the river. Well done.
The overarching visual effect of the map does confuse me a tad: the parchment and ripped edges imply a photograph of an old, authentic map, while conversely the actual line art is so clean and perfect that they appear computer-generated. Neither style is wrong, of course, but together they appear to ride the fence. Did you have an intended objective for this map? Answering that may help in offering advice.
I'm glad you posted!