From the top, black velvets do look like ebonies. If it has a white belly, it's not an ebony.
If the belly is grayish ... it could be a black velvet with ebony in the background.
It is very hard to tell what a chinchilla is by a picture. I have seen standard gray chins that were such a dark gray that you would almost think it was a black velvet.
To know with out a doubt, you need to know what the parents are and maybe even the grandparents.
A black velvet will have a faint dark stripe across the top of the front paws. It is visible at birth and will sometimes disappear for a short time, then later return. The black velvet starts with a black face, then the veiling will gradually darken over the top of the head, neck, back and tail.
But the proof is in the pedigree.
Jo Ann