May Allah guide us all.
Physical Attractiveness is not necessarily is the most important factors, as the prophet said, there are several factors, so choose religion before another:
It was narrated from Abdullah bin Amr that:
the Prophet said: “Do not marry women for their beauty for it may lead
to their doom. Do not marry them for their wealth, for it may lead
them to fall into sin. Rather, marry them for their religion. A black
slave woman with piercings who is religious is better.”
It is worth to mention that we should always remember to lower our gaze and do not go beyond aurah that should be covered.
The proposed answer
Although the following is the proposed way for those who took Physical Attractiveness important.
A guy can always ask her 'mahram' (those who can check on his behalf, such as her mother, sister, father or female friends) to check upon his preference.
Personally, I won't go that far. I will feel very ashamed to ask her for personal preference or state any requirements. I just accept and appreciate my partner as well as I am accepting my body god has given me.
Her mahram should not tell you how she look like, nor should one take a picture of her body parts that is haram to reveal to others. But to confirm whether or not does she fit and meet his preference.
Being attractive is beyond physical look. An attractive people are those that keep a healthy life and a healthy relationship.
Islam thought us to lower our gaze. One cannot deny the desire of wanting to try other women if we do not lower our gaze. Even if you have the most beautiful women in the world as your wife. Each women are beautiful, by look and by personality.
No women are desirable when she is not healty.