The two pics without the long goatee accentuate your strongest growth, which is usually a good plan for younger guys.

You are a big guy with a roundish face, which is why the long goatee looks a little out of balance. Not that this is necessarily a BAD thing, but that's why you are getting the feedback you are getting. That being said, I kind of like the first pic of your "long goatee" which isn't really that long...kind of gives your face a bit more character.

Regarding the 'stache, it is amazing how much more mature you look with it versus without. I would definitely keep it.

Patience shall be rewarded!

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