We really like your #16 concept, would you be able to do a version with the Austin skyline buildings (you don't have to include all - just whatever works- in order of importance) the Texas Capitol, the Austonian, the Frost Bank Building, the UT Tower, the 360 tower, and One Congress Tower.
Also it would be helpful to add something to the train to make it a little more clear that its a train maybe also make the bike smaller.
Great work!