Good call on repainting Nightwing's mask.
It reduces the total color, making the figure even darker and more monochrome, but it does make him look a lot more serious than the bright mask did. I just worry that you can't see his eyes at all, but that could easily be the lighting and angle of the camera.
Looking forward to seeing Tim Drake, everyone's favorite Robin. Are you going to go with the earlier, 90s look (short sleeves on the arms and green arms/legs), or the later new millenium look (longer arm sleeves, no green in the suit)?
Personally, I prefer the earlier look (since that was the era during which I read the comics), though the later look is a bit more along the lines of "Nolan realism." Still, the earlier look would help point out the character's youth, without resorting to the silliness that was the pixie fairy ____ Grayson/Jason Todd Robin costume.