Thanks for your feedback. If you click on my design and then leave comments I will be notified by email and can respond faster to your requests. The 'impossible triangle' design you linked me is found often in the logo world. I have gone for a hexagon within a hexagon which can change perspectives depending on how you look at it. It also resembles a diamond which I felt appropriate. Working on one more.
#3 I really like the "endless or celtic knot" look of #3. Would you mind doing one more in blue rather than the teal color you used. I would like to see how that would look. Thanks!
had another idea which I thought you may like so I am entering it just in case. Please let me know if there is any changes you wish made to any the designs.