Whimsical Submarine Journey Under the Sea
Stable DiffusionWhimsical Submarine Journey Under the Sea is an SDXL 1.0 prompt for a 3:2 children's book spread. A small yellow submarine with fish peeking through portholes and a waving octopus in warm coral waters creates an adventure scene in soft watercolour with gentle surface light rays.
Last tested: August 2026 with Stable Diffusion SDXL 1.0
Part of the Stable Diffusion prompt library · see more watercolor prompts .
Prompt
A children's book illustration of a small yellow submarine travelling through an underwater world, round porthole windows with curious fish peeking in, a friendly octopus waving a tentacle from above, coral reefs and seaweed in warm colours below, small bubbles trailing from the submarine's top, soft blue-green water with gentle light rays from the surface, watercolour texture with visible brush strokes, no text, no letters, no watermark
Negative prompt
blurry, low quality, text, letters, watermark, signature, photograph, realistic submarine, dark colours, scary, sharp edges, military, gradient shading
Settings
- Model
- Stable Diffusion SDXL 1.0
- Aspect ratio
- 3:2
- Steps
- 30
- CFG scale
- 6
- Sampler
- DPM++ 2M Karras
How to use this prompt
"Round porthole windows with curious fish peeking in" is the detail that makes this a storybook scene rather than a submarine diagram. Without it SDXL draws a military sub with flat square windows, which kills the whimsical tone. The yellow colour is non-negotiable — it is the storybook submarine signal, and any other colour reads as a real vessel. The octopus waving from above adds the character interaction that gives the page its emotional hook; without it the submarine travels alone and the scene feels empty. Light rays from the surface are the depth cue that stops the water from looking flat. Ban sharp edges and military specifically because SDXL defaults to realistic naval imagery.
Variations to try
- Swap the submarine for a small wooden boat with a glass bottom, same fish and octopus
- Add a sea turtle swimming alongside the submarine, same warm coral and light rays
Explore collections
What to do next
Adapt it →
Open this prompt in the Stable Diffusion builder, pre-filled, and change one layer at a time.
Explore more →
Browse the full Stable Diffusion prompt library — every entry tested with its settings.
For developers — copy this prompt as JSON
{
"title": "Whimsical Submarine Journey Under the Sea",
"prompt": "A children's book illustration of a small yellow submarine travelling through an underwater world, round porthole windows with curious fish peeking in, a friendly octopus waving a tentacle from above, coral reefs and seaweed in warm colours below, small bubbles trailing from the submarine's top, soft blue-green water with gentle light rays from the surface, watercolour texture with visible brush strokes, no text, no letters, no watermark",
"negative_prompt": "blurry, low quality, text, letters, watermark, signature, photograph, realistic submarine, dark colours, scary, sharp edges, military, gradient shading",
"model": "Stable Diffusion",
"model_version": "SDXL 1.0",
"settings": {
"aspect_ratio": "3:2",
"steps": 30,
"cfg": 6,
"sampler": "DPM++ 2M Karras"
},
"style_tags": [
"watercolor",
"whimsical"
],
"use_case_tags": [
"childrens-book",
"illustration"
],
"source_url": "https://promptkoi.com/prompts/stable-diffusion/whimsical-submarine-journey/"
}The whole library is available as an open JSON dataset · developer docs.
