Nice motion shots. I think I would have preferred more kid and less coaster in #2--cropping it square anchored at the top might help, dunno. Have you tried #1 in B&W? I like the contrast between the apparent calmness of the girl in the lower right and the excitement of the others. Good catch.
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Lensmole
http://www.lensmolephotography.com/
Thanks! I am actually standing about ten feet from them using manual focus on a kiddie coaster.