I just want to add about copyright in using some fonts on the bookcover. Not just be selective of the image(s) you use, but also make sure the font you use (if your novel got contracted) has a free license for commercial use too.

You can google the font's name to check its license or if you want to look for free-licensed fonts, there are sites such as 1001 fonts and dafonts which can greatly help you filter your search. Usually in the font's information details there will be statement whether the font is 'free for commercial use/100% free' or just 'for personal use' or you have to buy them to use them comercially :)

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