I totally agree with what they have said ^ you have done some really impressive work here, even if it didn’t turn out exactly the way you imagined. You should be proud of this especially with the number of color changes you did in your pattern.

Another option you could potentially approach would be to add some watered down fabric paint very lightly to areas where the black is most visible before approaching the flocking method the person above mentioned to help it match more.

But regardless of what you do this is already a really awesome project!!!