They look awesome. They both are obviously Good but the left one is more expressionistic. I feel like you expressed a feeling on the left image. Like saying you have to much on your mind and it's gonna explode.
The right one just shows what you're more comfortable with and its more polished and clean composition.
Overall my opinion is keep doing both and master the left style and keep it going.
Hell do a mash up of both styles in the future. :) Good stuff