What I have noticed is young folks like a larger mug and as people age they like smaller ones-this has held true for my 40 years in the mug business.
If you are collage aged you like a beer mug about 32 ounces . If you are retired an 8 oz is fine.
My mug info is here on the 7 sizes I make
I just looked at your color samples and I particularly like the effect you accomplished on #3 & #5. Would it be too much trouble for you to describe how you accomplished the glaze effects on each of these?