Bitter flavor... if you fertilized them right up until the end that can make them taste chemicall-y.

But you haven't cured the buds yet... you should put them in a glass jar for a couple weeks, check on them often. Open the jar for a few minutes every once in a while. Make sure there's no mold.
With a cure, the taste should sweeten right up.

Pretty bud, btw. It probably could have gone another couple weeks. That's what first grows are for!