If natural selection is correct , why all human beings are not beautiful?

My dad used to say that beauty is in the eye of the beholder.

My son says that beauty is in the eye of the beer-holder. Take your pick.

The way you term "beauty" would suggest only pleasing to the eye of the observer.

Natural selection doesn't say that beauty is the character trait chosen for procreational necessity but rather a spike in the code as a way of increasing the chances for that particular human to find favorable genetic links for future generations.

Beauty is largely based upon society and what is projected as beautiful but true beauty in procreational means is really nothing more than a code designed for another code reader to possibly find mutual benefits in joining together.

Your probally a fellow athiest trying to pretend to be a stupid christian.

Beauty is a trait for searching for a mate with the least flaws(therefore change of dying). It allows those whose perception of beauty choosing the male with the right characteristics to live on. It's always changing. Also "beauty" isn't set, if another ice age hit, short fat people would be the most beautiful once again because they would have a better chance of living (instintually being better as a mate)

Because beautiful isn't the only selection pressure. It's also not a constant... what's ugly to some is beautiful to others...

Why would they be?

Anyway, beauty is not really a selectable trait. Two beautiful people can have ugly children. It is based on the interplay of many genes producing a physical appearance made up of many different traits acting together. There is no "ugly gene" or "beautiful gene".

Natural selection is about, among other things, survival of the fittest. The fittest are not necessarily the most beautiful. FAIL.

If God created everything is correct , why all human beings are not beautiful

Different people find different people beautiful. At other times, choice of a mate was made for you or was based on how useful a mate was. It is only fairly recently that we have chosen our mates based on looks.

physical Beauty is not what the universe is selecting for.

Because beauty has not always been necessary for the survival of the species.