Novel AI has now become publicly available and includes numerous models including a furry beta, which seems to contain a lot of pony (they likely merged their pony model with it). And the results seem to be quite good overall.
It's even capable of creating lewd works too, which doesn't seem to be censored anymore, so that's something to note.

You can try it out yourself here: Novel AI Image Gen

Prompt: my little pony, fluttershy (mlp), solo, looking at viewer, cute expression, meadow, soft shading, hard lighting