Emoji live at 32 pixels
Silhouette and one strong colour decide whether it reads. Keep the subject to a single object with one clear expression.
Make a set, not one
Slack and Discord servers want a family: same style, same palette, six reactions. Reuse the prompt and change only the feeling.
Finish with a transparent cut
Run the background remover and you have a PNG ready to upload as a custom emoji.
FAQ
What size do I get?
A square image. Resize down for the platform, most want 128 pixels.
Can I upload it to Slack or Discord?
Yes. Cut the background first so it sits on any theme.
Why is this so cheap?
It runs on the fastest image model in the catalogue, which is the right tool at this size.