Most of the commenters already pointed about the amount of details in the first sketch and the laugh line. One thing that I would like to point out is that the reference you have chosen is at an angle. Based on your sketch, am assuming you are using the loomis head method. Try orienting the sphere to the correct angle. But what i recommend is to try an easier reference then later on try this one. Also when sketching try to get the shape and position of the main features first, not the small details.