Guys thanks for all of your answers.
I can figure out all of your point of view: maybe the tau females are not morphologically that different from male, and for sure this representations of a female being are quite subjected to a stereotypical image of the woman. Anyhow I like the badass look of those models. Maybe, as someone of you said, they're more focused on FSE armies, due to their personalization of equipment and their characteristics from which you can recognize one tau from another (dislike what happens in the main army, where the individualism appears to be lost to pursuit at best the greater good).
I can feel as well the copyright discussion. maybe they've gotten the inspiration (ok, one of these models is identical to a frank found on dev) from some arts and pics found in the web. And selling those models without the main author agreement is a bad attitude indeed.
But I think that even if the purchase on these models is something discussible, they can give us some inspiration on future modifications.
And I have to say, the KX139 with those little tau on the shoulders is just one of the prettiest things I have ever seen: they make the gigantic suit resemble even bigger, inserting a scale comparison.
Thanks a lot for the review links and for ALL of yours impressions about these models!
Have fun and keep talking about your feelings
EDIT: @boomwolf I perfectly agree on the software example. Same here.