Cindy I have also never tried water droplet photos but might one of these days. I do think you need to invest in a flash because your photos show some motion blur that the shutter speed is not freezing in place. A flash would provide the desired light to stop the movement. I do not have a Nikon flash at the moment but would suggest Godox as one alternative. I have also had very good luck with an older Nikon SB900 flash. It is not recommended these days because it was said it would catch fire if used over and over. It was replaced by the SB910 as I recall. But the 900 can be purchased for an excellent price and if used by someone like you or me and not a professional it is one of the best speed lights out there. Check on YouTube for reports on that flash. One video shows it overheating but only after constant flashes only a professional might use. This is only a suggestion and of course there are numerous speed lights out there to choose from. Great photographs by the way. I may give water droplets a try myself.

Dennis