The name for when a water drop is used as a lens is called refraction and there is a whole section of macro photography dedicated to it. I wrote a couple of resources about waterdrop refraction photography a while back, but its a pretty cool effect when you first find it .
Looking at your shot I would first say it needs some light (specially considering the ISO needed) BUT light in a refraction shot is actually very tricky, the more light you shine on the waterdrop the more the image in the drop fades so getting the right balance of light can be tricky. The image in the drop is pretty clear but you may be wandering into stacking territory to get the most out of the image if your'e working as close as this image appears to be. Good job removing noise from the image in post, let me know if you would like to see those resources and thanks for sharing
This is a short article for anyone who is interested in using refraction techniques in their macro; I use both droplets and bubbles for my refraction abstracts. Refraction can be done horizontally like in this picture: or vertically like this...
Hi, After request for details on this refraction shot posted here : https://macroderie.com/threads/gerbera-refraction-on-vine-tendril.2656/ I am detailing my setup, let's begin: This refraction is horizontal: It begins with a black cloth and...
macroderie.com
hope you find them useful, ask if you have any questions