Thanks for you work. We like a lot of elements of it! Just a few suggestions if you're willing:
#21: Is there a way to fill in the design a little more... somehow make it look a little more solid? We feel like it's a good start but missing something.
#22: We like this one overall but think that the dark blue in the middle of the circle looks too much like a fetus. Is there something else you could do with the middle or another variation of the outer part of the circle?
#23: We love this one. Great job. The only minor tweek we'd suggest is with the "fatter" part inside each of the circles (the rounded end)... we're wondering if it would look better if it was thinned out to taper at the end like the other lines in the design... maybe keep the width, just change the tip so it comes to a point vs rounded... hopefully that makes sense.