Great pics. As usual. My fav dithers are Silver Dollars. Shombourkii and Rubripinnis. But I'm beginning to think any of them will do. So many to choose from these days.
Shoot lots of photos....practice
Add as much light as possible...make sure it's off the camera
Don't settle for the norm...look for unusual and interesting highlighting behaviouf
Learn photography basics...a simple understanding of apertures, shutter speed & color balance makes all the difference in the end