Focus on Moving Better
Aesthetics are the byproduct of your movement.
Efficient human biomechanics requires balanced tensioning of the fascial system. A balanced fascial system fully potentiates the muscular system. Because human biomechanics requires the coordinated function of the entire body, these patterns will develop the body with balanced proportions and symmetry.
Often the primary focus of training is to improve physical appearance. Because aesthetics is a byproduct of movement, the primary focus of training should be to move better. Move Better, Feel Better, Look Better. It is no coincidence that the better someone moves, the better their aesthetics. Athletes are the prime example.