I didn't see a problem with it, until I was getting ready to post it. So, today I took another shot at it, adding more neutral and trying to keep the emphasis on the turtles and center rock. I ended up with this:
Turtles (15 x 20 Mixed Media on Paper)
I can't decide which one works better, but I think the turtles and leaf are better emphasized in the second version-- which was the point of subduing the black with more neutral. Anyway, I've gotten a big reminder about being careful with that black pastel. It's a little easier to see the fish in the second picture, now that the picture isn't overwhelmed by all the black.