Hmm I can't comment about the photography because I'm no David bailey either but I make a fair few pens, So for my tenpennorth as follows:
In the first 2 you appear to have gone under the dimensions of your bushings and indeed in the first one it would appear that there was a wobble in either the bushing or the mandrel, if that happens again, just stop the turning and turn the bushing 90 degrees and start again if it happens again get new bushings, if its the mandrel try not to compress it too much.
In the next 3 you appear to have done the opposite ie not turned down far enough, although I do rather like that echo of pyrographed rings on the comfort pen.
Still if that's what you are producing after 6-8 weeks then all credit to you:up: Another couple of weeks and you will be competition .
PG