I was playing with an idea cover of my current WIP in a 3D program. Because I do not have a credit card, nor debit, and a completely empty paypal, I cannot afford to purchase pictures from the royalty free sites.
And many 'free' pictures could have been used over and over again.

But looking at covers here, no one seems to use 3D art for their covers. Is it cliche?

I understand that realistic images are best, but what about a beautifully rendered 3D image?