I tried to use less saturated colors and lower contrast on these originally and was about to the point of posting here when I realized I only liked one of them. So I went back and edited them to put some life back into them. A lot of the detail does not show up at this resolution or even when I post the whole picture here. But now I like all of them better.
I rate each piece from 1 to 5 with 5 being my favorites. I originally rated one as a 5 a couple 4s and the rest 3s. But after revision 3 are now rated 5 and the rest rated 4.
I am making progress on creating my course for beginning digital artists. I posted an outline on Medium yesterday. You can see it here.