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To achieve this look you only need a brush to apply the eyeliner/eyeshadow. A thin, angled, eyebrow brush, whatever work for you.
I recommend using it wet because it will take and place the eyeshadow so you have a better accuracy. The only thing you need to do is to layer the blue shades, starting with shimmery white on your inner corner and going darker as you get to the outer corners. Think of it as an ombre eyeliner. Do the same on your lower lash line. Curl your lashes and add mascara. Use a lip balm for a softer look or a bright red to stand out.
You can also line softly your eyes with a thin line of black but keep it close to your lashes. I did it in the last photo but only lined from the half.
I like it with half of my hair tied or with soft romantic curls.