You are going to get tons of different advice because everyone has their own style. The best thing you can do is draw and draw and see what works for you. Pick up drawing books and practice from them. Sometimes you can find them cheap on ebay
or at garage sales or some libraries carry them or can get them for you.
My initial drawing would look similar to your first one. You have the basic overall shape and proportions going on. That is a good thing because a lot of people can't really *see* the outline and proportions. This is why a lot of art books tell people to use spheres and other basic shapes to start a drawing with. You don't really need too because you have the talent to see it and apply it to paper. You will even get better with proportions the more you draw. I would suggest starting the outline a big lighter so you can change and adjust it easier as your drawing progresses.
Now you need to finish it. Add detail. It takes time and patience to add the detail. Look at the shading and highlights. For example - the eye is never a solid color. Depending on the lighting there may be 2-8 shades that make up the depth of the eye. Shading is what changes a plain 2-D circle into a 3-d sphere. Learning to see those shades and highlights and apply them will be what adds the finishing touch to your drawings.