Was it inspired by Warcraft II / Wyrmsun by any chance? As Mandrill said, you got the proportions right, just need to refine it a little more and add stronger lights/shadows.
Here's a visual guide for Wyrmsun, it might help you: https://github.com/Andrettin/Wyrmsun/blob/master/documents/Wyrmsun%20-%20Visual%20Guide.pdf
You've got most of the proportions right. However, the palette lacks contrast which makes it hard to make out shadows.
Wow ! Thanks! That is a nice tutorial on how to draw fantasy portraits.