That female isn't a cello- she's a pastel. Cellos don't have any coloring on them, including any kind of iridescence or opaque "powder" on the body or fins. Pastel/opaque contain the following genes-
bl- steel blue
The male is a royal blue with yellow wash, you would likely get many steel & royal blues, some with faint red wash (from the yellow allele.) I agree with Victor, her spine could be straighter, as well as Injdo who pointed out that breeding a DT will result in more rays. The male is a rosetail, and you'd have many fry with rose/feathertail, bad scaling, short ventrals, shorter bodies and spinal issues.
I recommend you go through this slideshow I made.