Welcome to the board... you have the start of a pretty good young man's fullbeard already and you should carry it through to 3-4 months to discover your potential. I like your very wide and tall stache which will be sick when it fills in.smiley: smokin  Your sides are filling in nicely and you should not worry about areas of lighter coverage at this time. An 18 yo is expected to have a developing beard and you won't notice these areas so much once the hair around them gets length. 

I would take note of your neckline... I like the curve you have established but the line should be higher by 1-2 finger widths. From side views, there should be no hair visible on the neck and the line under the ears along the jawline could be nicely rounded.

Keep growing and showing every couple weeks... tell how you feel about progress on each update.

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