Superhydrofobia remake

This is gorgeous. Flawless focus on the center water drop, to the point where its refraction lens effect is also in focus.
I dont have any advice for improving the image, I think it stands very well on its own.
You could of course experiment with more supplemental lighting or boosting of the light source to see the effect using a narrower aperture to create a larger region of depth of field, but this image does not require it.
From a composition standpoint; you could also experiment with recomposing the image so the water droplet at center is off center instead.