Most beautiful or dynamic rising signs of each element?

Good genetics.

I have seen many beautiful women who are Aquarius rising

Fire: Aries

Earth: Virgo

Water: Cancer

Air: Gemini

Aries rising, a highly attractive rising. Virgo rising is attractive and smart and have clean, neat appearance. Cancer rising is attractive, especially on women. They look motherly and innocent. Gemini rising is attractive, smart and talkative

Fire-Leo for sure. Leo risings can be so charming, magnetic and alluyring with their brand of self expression, their personal entertainment .. They are the Actors/Entertainers of the Zodiac. Everybody loves them for the most part and they can literally get away with murder because they are the "One you would least Suspect." 

Earth- Virgo. They come off as intelligent. A good head on thedir shoulders. TThey would be described as down to Earth and they can dress classy and conservative...they are quite Innocent seeming. I have noticed that the Virgo Men can seen more of a brother than a potential Boyfriend a lot of the time... Nice guys finish last describes Virgo. This sign is the most used and abused of the Zodiac! Randomly speaking Virgo rising and or Sun/placement in 6th house Type People can often experience Car troubles and or accidents. They are known for giving their friends rides or taking up a driving job... Mercury rules over  Cars/.vehicles, short trips and they do rule the signs of Virgo and Gemini. Mind(Gem) over Matter(Virgo. Lol.

Air- Libra Risings can possess a very classic type of beauty!! Almost timeless... at times. hahaha

Aquarius risings are often very eccentric in either appearance, demeanor and or both

 SCORPIO rising should be very easy to spot. They usually have an intensity or magnetic appeal in some way...They appear to be brooding a lot of the time and they are usually very serious and are sort of the loner type...

Well that's my opinion. Sorry for the the long ramble...

Go ask a scientist. Do all “Cancer risings” look motherly and innocent? 

Aquarius Pisces and Scorpio are the best rising signs.