Judge a Book by its cover - photoshop stuff/ text layout

I had a mess around on photoshop with some practice images before working on my final cover, coming to the conclusion that inverting the scanned in images so that the 'cave painting' style drawings became white (on black) looked quite striking. I had tried some drawings in earthy colours with acrylic paint beforehand but they didn't look as bold and didn't suit being a book cover as well, despite looking more like authentic cave paintings.

I have decided that the best type layout is the second image down, ultra light with the title in the top left corner and the author's name in the bottom right corner. I feel like this layout is the most well balanced, and allows the image all the space it needs. I also toyed with the idea of using the dead animal image as the front cover but decided in the end that although that image has the potential to work on either the front or back cover, the other image of the two figures only really works for the front. Also, the dead animal image looks quite nice with a blurb above it. So, sort of by process of elimination, I've decided my final cover will have the two figures on the front and the dead animal on the back with a bit of a blurb. The spine I will keep simple, just writing in the same font all over. I decided that using a clean simple font, and the same font for everything was the best decision regarding type as the drawings themselves are quite loose and expressive.