Different sized bodies for head?

It would depend on the shoulder width and head size. The bigger the head, the bigger the shoulder width would need to be to look proportionate. It's not as dependent on height as they could lengthen legs or torso without changing shoulder size with just a 5cm change.

I'm not familiar with Telesthesia & Dragon but you could see if they list shoulder width in body measurements or if the company will show you pictures with the various bodies. Or you can look and see the head size on the bodies shown and how it compares to the sculpt you want.

 

Usually (I say usually because I do not know the company you reference) if they have the option to purchase with two different bodies the head is compatible with those bodies. I would double check the sizes like RebelViva said, but if they are similar it probably means there isn't much of a difference (other than height). Sometimes the taller body will have longer legs/a longer torso and the size difference usually isn't enough for it to really make this disproportional.

 

Actually requires a very vague answer! It depends on the head and on the body AND on the preferences of the buyer.

Okay. Some heads are "bulky" - broad-faced, strong chin, big cranium (think Volks for broad-faced and big cranium), others are relatively narrow or smaller overall (think the original Dollshe heads - Hound was the biggest, Saint was relatively smaller. So sometimes the smaller heads would look fine on shorter bodies (or "narrower" bodies, whereas bulky heads need the appropriate body width and/or height. Some heads may actually be a similar size, but the features may be more pronounced and so gives the head a more prominent presence that might overwhelm a smaller body if it was shorter or one of the more slender physique types.

Some companies' bodies are also essentially identical (especially some of the male bodies - say 62-65cm as one size, and they come in a 70-72cm version - and often the only difference is in the length of the legs, especially the calves. So, as long as the shoulder width is the same, and the neck circumference is the same, a head might be used on either body height.

Then of course, there's the buyer preference. Although the trend has been for realistic proportions in the last several years, there are still people who prefer a slightly "bobble head" look, i.e., the classic "doll look" and would choose based on that.

And then, if the wrong choice was made -- to some extent, you can also disguise some awkward proportions with bulky clothing, full or long wigs, and the ever-important Angle of View/Composition when taking photos (especially with larger heads on smaller bodies).