#6 also very good. Ilike the way yo used the colors I designated. It, too, is simple but very effective. It also would be a good logo for my health business as it expands in services
#16 has too many colors #15 has too much purple- can you soften the image by changing the colors around? Or perhaps by lightening the ones of the colors used?
#17 is also very good and would be good when my business expands its services. Can you play with the colors inside the lettering a bit? It looks like you used different colors for the letters and it seems a litlle bit distracting. Try to stay with the original colors scheme and see what you can come up with. Thanks and great job!