Treya, don't be disappointed with yourself. We all need some sleep and we all better learn from our mistakes instead of moaning about them. You now had first hand experience with colored lines and realized it's not your thing, as well as it being too time consuming.

If I were you, I'd finish the logo for either a later JDC or a different occasion, now that there is virtually no deadline anymore.

Oh one more thing, Jazz's left ear will look cutoff if used as the logo on JDC like this. Then again, such hand-drawn art is amazing enough for a mere logo for it to be a bother.