I think the sharpness is pretty well just about right for these. You can always be a bit selective and just sharpen the eyes a touch if you think it needs it beyond correcting for the anti-aliasing filter (when present).
I know what you mean about effects though. I find that, as long as they are relatively subtle, the recipient doesn't necessarily notice they are there: they just see a nice photo. But, whatever you do, don't give them a choice!! Go with what you wanted to create. Different if they are commissioned of course.