I love the use of color in a sketch always a nice touch. I also thought your facial features overall are sized very well. To me it looks like your perspective could use a bit of work for example with the ears on the bottom drawing are oddly placed usually the top of the ear lines up with the eyes and the bottom of the ears would be right around the bottom of the nose for a directly foward facing drawing. I also cant tell if you used any sort of constuction lines, if you didnt those can be very helpful. I personally have gotten the best results from practicing versions of the loomis method as well as drawing planar faces at different angles. I hope this helps some!
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