What I like: 1) Like how you captured speed in #17. 2) I like how you were able to feature the bicycle and rider in #16 while still being able to read BMX.
What I'd improve: 1) The rider and bicycle could be a bit more aggressive/realistic looking. No idea what specifically to tell you other than I'll know it when I see it... 2) Although Jamaican colors are officially black, green and gold, the gold tends to be more on the yellow side.