Great shot, it's not easy getting them sharp as I'm sure you've found! It's best to use manual focus and hit the button as your subject crosses the imaginary line. Looking at your other shots it would appear they are coming to a feeder so best to set the focus a few inches behind and hit the button when they are almost there. A lot of trial and error involved!

I like this. I hope you don't mind me adding (as a newbie) that I like the natural blemishes and drops of water that have not been 'cleaned up' leaving a live feel. It could almost pass as Art Deco!

Dave J