Wonderful, I love those renders! The colors and the lighting are really spot on.
If you want to get your towels to the next level, I recommend you to have a look at my TurboSquid products.

I spent quite a lot of time to get those towels looking good without the use of CScatter or anything, just using displacement. It's easy to handle and you can apply the material to any properly UV mapped base geometry.
To get it straight, I don't want to promote myself here, I just wanted to give you the hint. Because towels are one of the most critical parts of an image to give it away as a rendering.
Anyways, congratulations to those lovely pictures!