If you're using RPG Maker MV (It's pretty much the same for any RPG Maker you use actually, Just the buttons are in different places and/or worded differently), You basically do the following:
1. Once your DAZ3D Renders are done, Go into Photoshop and do touch ups, etc.
2. Export too PNG or JPG. Depending on which RPG Maker you use, As some dont recognise Jpg and vice versa.
3. Move the scenes in the "Pictures" folder in your game file.
4. Open up RPG Maker.
5. Click "Show Picture"
6. Ensure the X and Y align to fully cover the screen, Other wise it will only shopw half of the picture. (Usually 70/80% for each is fine, Depending on the resolution ofc).
7. Once you are done with that picture, Ensure you click "Erase Picture", then click the number you set it as. Otherwise you will be stuck on that scene. And the game will break.
8. Rinse and Repeat.