My father-in-law has written an amazing book about the possibility of pre-Captain Cook explorers, perhaps Dutch, that arrived in the estimated time frame of around 1590. I am a graphic designer and he wants me to design the cover. I have finished designing the background or scene and am ready to pop human characters in there like some Dutch sailors in a pinnace approaching a lava rock shore with a few native islanders watching them with intrigue and perplexation. My point is that this character creation thing would allow to me complete the book cover much faster and it would look way better...........also it would allow me to create a custom unique book cover design instead of borrowing or using stock photos from the internet. 

I am a veteran graphic designer with the Adobe package, but am brand spanking new to the whole 3d design thing so I have a few questions. If I have already created the background in Photoshop, is it possible to import custom 3d created characters on top of that background layer in photoshop or must you import the flat photoshop background into CC3? Would I be able to import each character into Photoshop 1 at a time or must I import them all at once? Some characters will be in a pinnace approaching the shore so they will need to be in a layer under the pertaining layer with the pinnace. I understand that these 3d characters are mainly for animation and video games, but is it ok to use them for high quality printed images such as a book cover? If this 3d character creation thing really is compatible with the Adobe package, I will be all in and purchase. Please help me learn more.

Mahalo nui loa for your time,
Ian