I'm currently working on a desert town as well and while mine probably won't look too much like this, I found it useful to see how someone else would do it. Whether or not a map looks good is extremely subjective, but despite any criticism you've gotten, the link to the Mack tiles is useful in and of itself so thanks for that!
I'm also curious if you Playtested this because when I used that same tile for my pools of water, I found it to be pulsating, which looked very weird. While this would look good on a beach, I'd have to make a big pump in the water to justify that movement in a desert. I'm thinking I'll have to use the default water tiles to avoid this unless I'm not aware of something.
As a side note, I'd just like to say that I don't think pools of water are bad in a desert. People have been living in the Middle East since the dawn of mankind and there are not enough lakes/rivers for everyone to live by them. That is why man invented the well. I personally am making my water spring up from under the ground to avoid sticking tons of wells on the map. Either way!