ok what you want to do is add a row where i marked in red. One thing about getting a smooth mesh and poly placement. You want to try and keep you polys evenly spread through your whole model unless there are spots that need more polys but those are always exceptions. Again the more evenly spaced your mesh is, the better your results as long as you make sure it is aligned properly. Just add that row and the in the side view, your going to want to lift it up a bit to round it instead of having it flat.

looks good so far, keep it up