Def­i­nitely there are a few design com­po­nents that if you choose a cou­ple to focus on within a piece will help make the final design look bet­ter. You basi­cally described some of them while work­ing through, but this is the list I pick from when I design.

1.Unity
2.Gestault
3.Space
4.Dominance
5.Hierarchy
6.Balance
7.Contrast
8.Colour

by Ryan Hamil­ton

hope this help :P