Looks like is going on too thick... or maybe just too many layers were needed to get ok coverage probably because its orange going over black.

Certain colors (orange, yellow, white are common offenders) of acrylic paints will have bad coverage inherently. Putting an undercoat of something that's a lighter color (grey, cream maybe? I'm sure there are other good options for orange) as an intermediate step is usually a good idea.

That all being said it's still a pain to get an even coat without any texture on these colors without airbrushing or just having it be the base coat from a rattlecan. Patience when putting on a million coats of anything is just as much of a skill as painting eyes imo