
Self-publishing authors know the truth: readers judge books by the cover, and the cover is often the difference between a thousand sales and none. AI image generation has made professional-looking covers accessible — but only if you understand what genre conventions actually require.
Scroll Amazon's top 100 in your exact subgenre. Note the shared visual grammar:
Your cover must look like it belongs on that shelf. Distinctive within the genre, not different from the genre.
KDP requires 2560×1600 pixels minimum for ebook; 300 DPI at trim size plus bleed for print. Generate at the exact aspect ratio of your book's trim (most are 2:3 or 5:8), leave room for title and author name, and remember that Amazon thumbnails are tiny — test legibility at 200px wide.
Generating just the front is beginner territory. For print, plan all three surfaces as one spread.
Fantasy:
"epic fantasy book cover composition, lone figure in cloak approaching distant glowing tower, dramatic atmospheric perspective, volumetric fog, deep jewel-tone palette, ornate flourishes in corners, space reserved for large title at top"
Thriller:
"thriller book cover, high-contrast monochrome with single blood-red accent, silhouetted figure from behind walking into shadow, cinematic wide composition, space reserved for bold title text lower third"
Literary fiction:
"literary fiction book cover, abstract composition, single conceptual object against muted background, off-white paper texture, intentional negative space, minimalist, quiet mood"
Most AI models still fail at generating legible title text directly. Generate the image cleanly, then add typography in Photoshop, Affinity Publisher, Canva, or Figma. The professional look comes from font choice (not more than two typefaces), hierarchy (title 4× the size of author name), and kerning.
A professional cover designer runs $300–1500. A DIY AI-plus-typography workflow can match quality for $0–50 if you care about the craft. For a debut, budget cover designers are worth it. For series books 2+, the DIY skill compounds across every future title.
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