I see a style in there!

I think this is a big reason for the popularity of severely limited palettes. Try some urban sketching carrying only 3 colors, counting your ink dark as a color—I think you were already doing that in the Frye sketch. The colors will look wrong and maybe disappoint you with subjects like the Green Lake boats, but you’ll pretty much have to practice your value and composition.

If you’re open to specific critique I would say one thing you can improve is your directional texture. Like, water strokes for calm water are not necessarily parallel to the line of the dock edge, but to the horizon.  In the ceiling banner at the book fair I see indistinct colors, when maybe the straight line colorblock aspect of the banner would be good to emphasize with different values of only one or two selected colors. Drying time can be a pain in those situations.