How to use the nodes editor and the bsdf principle to paint a character

Good evening! I am not yet good at materials in the node editor and have a question and I know that here you can help me. How to use the nodes editor and the bsdf principle to paint a character by putting more color? In this image I indicate the colors green and white. The colors brushed on the arms and fingers are not the issue but if there is a way to solve thank you. How to handle this with node editor and along with bsdf principle?
Whether there are people with video tutorials or sites where they have learned.
See the link and click on the thumbnail to enlarge the image!
https://uploaddeimagens.com.br/imagens/desenho-png-c65093cf-3859-4ce3-8e23-cde698e77f9d/mostrar-codigo