I'd like to have greater control over facial expressions and emotions. Right now I use the mouth, eyes and eyebrows to fairly good effect. As yet though, I haven't made use of the eye dials. The whole array;
cornea bulge, iris in, iris out, iris big, huge, pupil dialate, slit, oval, I have to admit I've never used them yet. I have two emotions I'd like to portray for a forthcoming render. They are coy/shy for one model and persuasive/seductive for the other. I'd love to know how I can use the eye dials to assist in adding something extra. Can anyone help please?

It's well known from studies of perception that dilated pupils are seen as more attractive; specifically indicating affection or receptiveness. Those other parameters are (I suspect) aimed more at creating mutants, elves, etc. (Cornea bulge might be useful in a training clip for optometrists, though!)

lol at ockham. There are a slew of morphs to get some great expressions. Not overdialing one of them is the trick. Mixing smile (L+R) with frown, or nose wrinkle with eyes baggy and eyewince. Don't forget you have the negative spectrum, too. -1.00 to +1.00. Blink -0.200 with eyewince 0.700 and eye up/down....reduce lacrimal size when to get into big left and right turns...helps There are those custom facial expressions that can put you in a new zone...AMGoddard/daz. Raquel/twosheds... Aside from pupil dialation, the rest are there for matroom nodework...reflection, refraction, wetness...subtle stuff that we all struggle with.