I found the blog of a Nigerian artist from England - Adebanji Alade. I started watching the videos. The one about the angles stroke a cord. I have such hard time drawing correct angles - it is very frustrating. I know it would make a lot of difference to my drawings. I decided to practice drawing faces and measuring angles.
Not bad at all, if I say so myself! There is even a likeness with the original picture. Some angles I had to measure few times to get them right.