Which of these came from a limitation?

Three. Dither fakes tones a two colour display does not have, grain hides the banding a cheap screen shows, and chromatic fringing is a lens failing. All three were problems before they were styles.

Can they be combined?

Some. Grain over a mesh gradient is the most common pairing and is effectively the grainy gradient entry. Dither and grain fight each other, because one is ordered and the other is random.

Do these work at small sizes?

Mesh and iridescent do. Grain, dither and chromatic split all depend on detail at the pixel level, so they disappear or turn to mush when the picture is scaled down.

Gradient and noise

How a colour transition is handled, and the wording for each one.

These five are all decisions about one thing: what happens between two colours. A smooth blend, a blend broken by noise, a blend that ignores the object entirely, a blend faked with scattered dots, or three channels pulled apart so the blend happens at the edges. Each has a different reason for existing, and three of them come from a limitation rather than a preference, which is why they still look like something rather than like nothing.

Smooth, and broken

Three ways a blend behaves, from perfectly clean to deliberately noisy.

Mesh Gradient

Several colour points bleeding into each other across one smooth field, with no edges at all.

Grainy Gradient

A smooth blend broken by heavy noise, densest where the two colours meet.

Iridescent Gradient

A form with no colour of its own, washed in a continuous spectrum that ignores its materials.

Faked and broken

Two conventions that come from a machine failing, and stayed because people liked the failure.

Dither

A gradient faked with a regular pattern of two-colour dots, because the palette has no in-between.

Chromatic Split

The red, green and blue channels pulled apart, so every edge fringes in colour.

Draw one of them

Copy a prompt into an image model and pay for that one run. No subscription.

Open an image model

Other style groups

Drawn traditionsHow a character is drawn by hand, and the wording that gets each tradition.9 drawn styles Anime and mangaThe looks from Japanese animation and comics, and the wording for each one.8 anime and manga styles PaintedThe painting media, and the wording that gets each one out of a model.7 painting media Made by handStyles built from real material, and the wording that gets each one.10 handmade styles Rendered in 3DHow a computer model is made to look like something, and the wording.11 render styles Soft materialsThe surfaces that make a hard form soft, and the wording for each one.10 soft surfaces Applied overStyles that put one thing on top of another, and the wording for each.4 layered styles Character shapesHow a figure is built and finished, and the wording for each decision.12 character styles Studio looksThe looks asked for by studio name, described by what is on the screen.8 studio looks Technical drawingHow a thing is specified rather than depicted, and the wording for each.7 technical styles

Print stylesPrinting a sheet rather than drawing a character? The same reference, for ink on paper.

They are all decisions about what happens between two colours: blended smoothly, broken by noise, ignoring the subject, faked with dots, or split across three channels.