Great job with both the TD and the bucket.
Yes, it is always difficult to paint everything "perfect" when doing it by hand, but it will not affect centurion standards.
At the end of the day they were all painted quick and by hand in the original trilogy so if you look closely you see the imperfections. Most people won't even notice.
you can always use the painters tape to create the outlines you need (if you look at my bucket build you will see what i mean) in order to get those outlines straight.
Overall though, you did a nice job.
Also, as far as the stripes, you can always order the masking templates from trooperbay. They work perfectly.
Good Luck