Just a few quick comments that could probably help out with the face. You should first start off by using refernce images, both front and side, and then try to build a face that matches it exactly as this is probably from imagination so it is harder to pick out errs.

Also to create symmetry in your face duplicate it along the negative axis that passes through it, this is usually negative X, then check instance. All you'll have to do from there is work on one side of the face and it will happen to the other side. When you are done combine the Polygons then Merge the vertices together. (The eyes look different)

To help with faces just practice on using refernce images, they could be pictures or sketches, just practice will get you there.