Gorgeous work, and love the detail in this piece. If nit-picking, I might suggest adding more hi-light to each scale to make it look "shiny". I love bettas and this really gives a feeling of flowing movement. Well done.
Gorgeous! Very meticulous and just amazing. Excellent placement of the subject, nice contrast with the background and love the fact that, just like their personalities he's to big to be contained. Love it.
I used to have a fish that looked just like this. He (or she, I never knew the gender) was rainbow colored. I don't have fish anymore, but betta fish are definitely my favorite. This is a very lovely work of art.