I am loving your minimalist outfits. Is this a relatively new hairstyle for you? I think you may be feeling the difference because of that. When my daughter went from long wavy hair to, well, a shaved head, and then short styles as it grew in, she found the balance of her outfits needed tweaking. She ended up going with more dramatic eye makeup, big dangly earrings, and sometimes a beanie.
If you want to add more gamine without cancelling out the minimalism, what about adding one slightly more feminine tweak to your hairstyle? Like a kiss curl, a gelled swoop, or little bits in front of your ears? I haven't worn a pixie since I was 8, but Angie and others have done some modifications like that.