The eye and nose part is really really cool! Regarding your comment/question on how to colour, what would be your preferred technique (paint, coloured crayons, pastel, etc) ? Do you wish to have a realistic result (matching colours to your reference picture) or to do your own interpretation?
If you are interested in learning about colour, colour theory is a must and you can learn a lot on the internet. Check for example, this link out: https://www.blenderguru.com/tutorials/understanding-colors