As FeatheredFeet said, with unclipped coats and hay bellies, they are not showring ready. But, I do have to say they are very cute.
If you don't already, you should consider body-clipping them. Minis tend to shed out way later than horses, and when the hair grows back, it is "fresh" and clean, as well as rich in color. If you do feed them grain, consider cutting back a bit on it and exercising them more. Going up and down hills, jumping, carrying weight, even lunging helps! They would also need cut down bridle paths.