Leanness makes bone attributes more prominent, and lean folks appear less "smooth" as compared to fat folks.
Very, very, very few folks take enough HGH, and most lack the gene, to have acromegaly. In those folks that have the gene for it, acromegaly occurs in about 6 in 100,000 humans, with, or without, exogenous GH.
AAS don't promote bone features other than leanness, balanced fat distribution, and increased muscle mass.
Some folks, endomorphic somatypes, have larger bones and rounder features. Fat folks are smooth because of the excess fat that they carry. Other folks, ectomorphic somatypes, have longer, and smaller bones, and, sometimes, more jutting features. In either case, when they're lean and healthy, those bone features become more apparent.
For TMJ muscles, in particular, sometimes, folks chew gum (yes, gum), or clinch their teeth when lifting, which gives them muscle tone as compared to their sedentary counter parts. They look younger, longer.
Understand, healthy folks won't have smooth lines.
As a point of note: United Health Corp commissioned a study on health in the year 2020, whose results were released yesterday. That study predicts that fully 1/2 of all Americans will be type 2 diabetic by the year 2020.
We'd all do well to look like athletes. It's a VERY GOOD THING.
The body makes various adaptations contingent to environment.