I think of the female dwarves like NW_Kohaku's dnd example. Probably cause thats what I'm used to seeing back when I played Neverwinter Nights and a female dwarf joined the party. Bout as tall as they are wide, broadshouldered, a bit heavy, a bit busty, and beardless. Just in general I think dwarves weigh more than a human, dwarves are jus really compact and heavy set, really dense I guess.
Unfortunately, that isn't currently reflected in-game, as all of the tissues dwarves are comprised of are the same tissues that every other creature is comprised of, meaning they all have the same density, but also, most tissues have a density of "500" (which is in kg/m
3 to make the unitless numbers in DF into metric), including bones and almost all internal organs (only fat and muscles have non-dummied out values), which is half that of water.
As such, dwarves are size 60,000 and humans are size 70,000, and the only structural difference between them, according to raws, is that dwarves have a larger liver (which is, again, half as dense as water, and less dense than any tissue that has non-dummied values).
The only area where dwarves can compensate for this is in their bonus to strength, which arbitrarily adds muscle mass (that actually signfiicantly slows dwarves down so that they move, on average, once every 12 turns instead of the 10 they once did), which in turn adds density and mass.