How to Write AI Art Prompts That Work

Q: How long should an AI art prompt be?

One to three sentences covers most images well. Algo accepts up to 1,000 characters, but specificity beats length — five precise details outperform twenty vague ones. Add words only when each adds a decision the AI would otherwise guess.

Q: Why does my prompt produce something different from what I imagined?

Whatever you didn't specify, the AI decided. If the lighting surprised you, you didn't mention lighting; if the framing is odd, you didn't give a camera direction. Fix by naming the thing that surprised you and regenerating.

Q: Should I put the art style in the prompt or use the style picker?

Use the picker — Algo appends the chosen style to your prompt in the proven format. Reserve the prompt text for content: what's in the image, where, and how it feels.

A prompt is a brief for an artist who paints instantly, never complains, and takes everything literally. The skill isn't vocabulary — it's deciding what to specify and what to leave free.

The four-part pattern

Subject + setting + mood/light + one telling detail. In that order, roughly one clause each:

A fortune-telling shiba inu [subject] reading your fate in a giant hamburger [setting] in warm cafe light [mood] with tiny floating symbols around it [detail]

That's a real sample prompt from the app, and it demonstrates the trick: each clause makes a decision the AI would otherwise make for you. The parts you leave out aren't neutral — they're delegated.

Copy-paste starting points

Portrait:

Close-up portrait of an elderly fisherman with a weathered face, soft window light, quiet dignity, detailed eyes

Landscape:

A mountain lake at dawn, mist rising off the water, pine forest reflections, serene and cold

Character:

A young inventor in a cluttered workshop, brass goggles pushed up, warm lamplight on blueprints, hopeful mood

Scene with story:

A lighthouse keeper's last night before retirement, watching ships from the gallery, storm clearing at sunset

Pair each with a style from the picker — the same portrait in Van Gogh, Photorealistic and Watercolor is three different artworks (see the style guide).

Upgrades that reliably help

Name the light. “Golden hour,” “neon-lit,” “overcast soft light” — lighting words are the highest-leverage tokens in any prompt.
Give a camera direction for composition: “close-up,” “wide shot,” “from above,” “low angle.”
One emotion word sets the palette: “melancholy,” “triumphant,” “cozy.”
Cut the wishlist. Ten competing details fight for one square image. If everything is important, nothing is.

Debugging a prompt

Wrong subject emphasis? Move the subject to the front and cut competing nouns.
Flat colors? You didn't specify light or mood — add one of each.
Weird composition? Add a camera direction.
Close but not quite? Rerun as-is — sampling variance means the next sibling may nail it. Algo's history keeps every attempt with its prompt, so you can diff what changed between the good one and the rest.

Steal from the samples: Algo ships 14 curated sample prompts, each paired with its ideal style. Reading them is a masterclass in the pattern above — tap one, study why it works, then make it yours.

Practice on a real canvas

1,000 characters of prompt, 8 styles, instant results. Free to try on iPhone & iPad.

Download on the App Store

FAQ

How long should an AI art prompt be?

One to three sentences. Specificity beats length; the 1,000-character ceiling is headroom, not a target.

Why does my prompt produce something different from what I imagined?

Whatever you didn't specify, the AI decided. Name the surprising thing and regenerate.

Should I put the art style in the prompt or use the style picker?

The picker — it appends the style correctly. Keep the prompt for content.