Question about rendering Sun-Sky Only Environment Mode

Epic82

I'm trying to figure out how to render scenes in the Sun-Sky Only Environment Mode. In the promo images for a product like Andrey Pestryakov's Low Tide set, I see in the background of different camera angles that there is a blue sky with clouds. But when I render this set in Daz Studio, the lighting changes, but I can only see the grey default background, as you can see in the screenshot I've attached to this post. There are other products I own, mostly from Andrey Pestryakov, that have a sun-sky render setting preset similar to the one in Low Tide. If Daz Studio on my computer is rendering the Sun-Sky Only Environment Mode properly, then what is the purpose of having a render setting without a background? Am I rendering this properly? It's difficult to find another render setting from another product that can complement this set. I'll appreciate anyone's help. 

Andrey Pestryakov

I make my promo images on a transparent background like yours.

Then I save the image in .tiff so that there is no gray strip on the horizon, and in the 2d editor I add a sky picture to the background and adjust the brightness/contrast.

Epic82

Andrey Pestryakov said:

I make my promo images on a transparent background like yours.

Then I save the image in .tiff so that there is no gray strip on the horizon, and in the 2d editor I add a sky picture to the background and adjust the brightness/contrast.

Thank you for your reply, Mr. Pestryakov. That's helpful.