What is this illustration style called? Monochrome with pops of colour, realistic digital drawing

Question

I love this style of illustration and would like to find some tutorials/articles about it but not sure what to call it for searching.

Lots more from the same artist here: https://kriziachan.com

Answer 1

Mixed Media Illustration

Generally called Mixed Media Illustration, this particular case it's about watercolor over pencil illustration.

Another artists with similar illustrations:

Kelly Smith

Yoco Nagamiya

Ana Santos