Have a look at the above image. It's a stock image and in this tutorial, we will learn how to create a vector avatar from such photos. So, let's start-
1st Step
First, crop the image in Adobe Photoshop and take it to a new document. It's better to place it on a new layer and add yet another layer on the top where vector shapes can be added.
2nd Step
Now, use the Eclipse Tool and draw an oval shape around the face. The shape doesn't need to be precise or accurate. Then select the shape and go to Object > Path > Add Anchor Points. This way, you can add as many anchor points as you want.
Make the path outline the face precisely with the help of the Direct Selection Tool.
3rd Step
Now You need to repeat the same process for ears.
4th...