Hmm, in this case, The schoolgirls who will be appearing in the upcoming miniseries are standing besides the reference. It only takes a few clicks to find the average of height of a teenager. Then you simply decide how tall or short you want them to be. That is actually a nine foot wall. Not too many characters in the Poser world are nine feet tall. The Poser Measuring Tool also works well and lists items in feet and inches. As far any other figure goes, there is a table that shows their height above. I provided a link. So I take M3 or M4 as a starting point and then increase their size using the Figure Height menu.

Is that what you wished to know, @MKDAWUSS? Let me know. I'm cooking sketti with sausage right now. I wish I had some red wine.