Differences between symmetrical and asymmetrical balance.

vertical symmetry balance

Vertical Symmetry 

Each vertical half (excluding text) of the poster is a near mirror image of the other, emphasized with the reverse in colors. Even the
perfectly centered text picks up the color reversal here. This symmetrically balanced layout is very formal in appearance.

Asymmetrical balance

Asymmetrical 

This poster typically off-center or created with an odd or mismatched number of disparate elements. The two actor were sitting more to left site. When the left and right sides of the design are unequal it is said to have asymmetrical balance. Moreover, asymmetrical does not necessarily mean unbalanced.