There is a natural tendency for us to want a happy occasion to last longer, and we usually like to take pictures during these occasions to relive the moment.
This tendency is here because subconsciously we know that we can't hold onto anything. We know that the memories will fade, that people will change, that the happiness is just a fleeting sensation. And this is what makes this life beautiful. Change is that which gives meaning to every moment of this life.
What we need to accept is change. Change is this life. Change is what creates this persona in this world. Without change this world will cease. Impermanence is the nature of this world, and it's what this life is about.
By seeing this, we know there is perfection in the imperfections.