So first off, with any FF, don't judge TOO harshly the first year, though with experience and knowing lines etc, you'll recognize some things that you can eventually judge on a FF udder. Typically you need to give some FFs another freshening.
Coco: She's not terrible. She could use more medial strength and definition to the udder floor. Her teats are a bit wide set and could be more straight vs out to the sides. She could use more roundness up top. She seems to be lacking some capacity if this is her 2F. Some of that could be feed/management too, as far as capacity. Herfore could use more smoothing.
Gaisha: I like how wide she is and she's got width in the udder. Her upper attachments might need a little more tightening. But she got a better shape. Her teats are pretty wide-set and not straight. She looks like she will be pretty capacious. She's got a better medial than the first but could be improved, it might improve more next fresh. Her fore is hard to see, is it short?
Himei: I think she's my favorite out of all. She looks to be pretty well attached. I won't judge height in pics because I have found sometimes height doesn't come across in pics, esp on the stand. IDK why but I can have a doe with a high udder look like she has a lower udder in pics. She has good teat size and better placement and is straight down. Next fresh they may improve more when she is making more milk. Her fore is much smoother blended than the others.
Pizazz, decent attachments, wide set teats I suspect she will fill more up top next fresh and pull the teats in more possibly. Needs a stronger medial. The fore udder is good. Could use more blending but better than the first two.
Kahlua: Good fore, her main issue is lack of medial which is why the teats go out.
Bahama: Could use better teat placement and medial. Bigger teats. She has a nice wide udder.
Overall, you need a buck that has impeccable teat placement, teat size, and a strong medial and I think you will see some improvement. Not a bad bunch to start with though. One thing that we can't tell from pics is orifice size. If they milk a teeny stream that's not desirable. You want alot of milk coming out the orifice. Also udder texture.