Mixing Color with Black and Grey in a Sleeve : tattoo

So I'm working on building a traditional leg sleeve. I have three tattoos now, 2 in color and one small one in black and grey. I'm not totally sure which direction to go in the future so I was wondering if anyone wanted to share their experience, or pictures of sleeves/leg sleeves/collections that mix color with black and ……

Black-and-gray - Wikipedia

Black-and-gray (also black-and-grey, black and grey/gray) is a style of tattooing that uses only black ink in varying shades and typically uses a single needle. This tattooing style is thought to have originated from prisons in the 1970s and 1980s and was later popularized in tattoo parlors.…