Paul himself is descripted as childish looking for his age (15 at the begin of Dune) and rather scrawny and small in comparison di Feyd Rautha (by the end, age 17) despide the years of battleing and the weirding techniques and weapons training. Nor women are ever described as junonic apart from a later character from the God Emperor of Dune, who is an exception and considered a peculiar looking giantess.
The humanity as product of the Bene Gesserith opera is faster, longer living and smarter then the, let's say, current model, and probaly even stronger, but it's never pointed that they might look much different then us.
bro they're all aristocracy/leadership caste in an 10000 year old empire. As you know, irl tall = much easier to be in leadership.
Leto: 6'4
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Jessica: "tall" (for women that's ~5'7ish or more) (and obviously a great beauty as in every depiction and as any consort for aristocracy would be)
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Grandad: "tall" (for men that's ~6'1 or more)
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Shaddam (dad's cousin): tall
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Irulan: "tall" (2nd cousin?)
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Just as an fyi, you can literally observe this "upbreeding" (taller handsomer men/more beautiful and taller women than avg) in action in real life in several super high end city areas across the nation right now, off my back porch as one place. Fr Fr no cap fam.
For paul we never hear specifically what he is later in life but here's what he turns into after being short as a youth (before/after) (note his throne is supposed to be giant):