I think most of the people mentioned (living or dead) are reasonably attractive in terms of face, body, legs, etc. but here are my snarky criticisms (myself being marginally in shape at best) and genuine compliments:
As far as legs - I would say CP Mary and the late Princess Grace have the best legs. Maxima and Diana - both knock-kneed, Letizia and Marie-Chantal - too skinny, Lady Gabriella DOES have thicker ankles, and Mathilde looks like her LONG legs swallowed her lower torso. Both she and Mette-Marit have questionable posture which makes it look like their breasts are sagging/resting just above their hip bones (Mette-Marit not so much because she has a longer torso but her posture sucks).
Among those who have had multiple births, Rania, Marie-Chantal, and Marilene are too skinny. Most of the rest have very good figures for multiple pregnancies, the best IMO being Queen Sofia, Infanta Elena (GREAT body), Queen Silvia, Archduchess Marie-Astrid, Princess Margareta of Liechtenstein, and Martha Louise.
As fas as the men - like the women - I would not consider most of them to be unattractive or out of shape. Mostly they look at the same fitness level as other "regular" men of the same age. Among the older men, Grand Duke Henri and King Carl Gustaf have figures I believe would be more fit than the normal in their age brackets. Among the younger generations, Haakon seems to be in good shape, Pavlos and Maurits seem to have a good bodies, Inaki has let himself go some but still is in good shape. Kyril of Bulgaria, while not very bulky or muscular has unbelieveable definition and low body fat. Compared to the others in his family, this seems unusual, so I question whether or not he is able to attain this with diet and/or exercise alone (I believe he bicycles a lot). I would guess that he uses some sort of nutrition supplement/dietary aid to achieve such a low body fat percentage as opposed to illegal narcotic drugs.
On the drugs issue, on this and other boards I have read many folks opinions about the Casiraghi's bodies and/or attractiveness. IMO Andrea used to be the most attractive of his family and the entire age group among royals. Now he looks like he has a serious problem with drug addiction. It may not be the case, but that is how he appears, at least to me. In addition, the sloppy, dirty, uncombed appearance as well as bloodshot/dark circles under his eyes only adds to that impression. Other than the chain smoking, Pierre seems to be more healthy than Andrea, but a speedy metabolism can change. Once it slows down, his body will fill out a little more and I believe he will be more attractive.
Lastly, I would like to address the issue of excess weight. This could apply to any of these people skinny or heavy. I find that my impression of a person's attractiveness has less to do with their actual weight as opposed to their comfort level and perceived personal happiness with life/themselves. GD Maria-Teresa's weight has fluctuated for years (which leads me to believe their is an emotional component to her weight issues), but my impression of her is one of unhappiness and lack of confidence. She is a beautiful woman, but comes across like she does not believe that. Another case is the Duchess of York, who has never been a classical beauty but seemed IMO attractive during her engagement and wedding. Weight gain and poor styling choices earned some harsh and sometimes cruel and unnecessary criticism and she became unattractive. Like it or not her association with Weight Watchers did her some good and for a while she became somewhat attractive again, but now, when she is thin as ever and with whatever plastic surgery she has had, she seems less confident, almost desperate, and unattractive.
Conversely, Queen Beatrix was her thinnest for her engagement and wedding. Other than that, she has at best been chubby. Somehow, however, she is more attractive to me because she seems happy, and comfortable in her own skin. Whatever health issues she may have/develop, she seems to have a vivacious spirit.
All of that being said, these are my top pics:
Female - Mary of Denmark (I actually don't think she is pretty, but she has a rockin' bod)
Male - Its a shame he is not taller, but Prince Carl Philip. Enough muscular development to look athletic without being "pumped up", and not so skinny that he looks like a meth-head.
Rascal