Great question, and observation - ou spotted one of the flaws of this fly.
Ideally, the transition from the tag - herl - body should be a smooth graduation. Unfortunately, when i was wrapping the underbody (white floss) i started it too far forward.
It should have started under the tag, butt and continued up through the body to form a nice taper.
This is something i've been working on with my flies and the latest few are much better than the first few.
Its all about taking small steps, as there is so much going on with each fly its hard to get everything right from day one as a beginner.
I think on the full dress
Silver Secretary i posted a while back, the transition is much more gradual, though on that fly, there is no butt.
Thanks for the comments, its nice to know folks look in detail at the flies. Those observations help me to improve.
Ill continue to post flies as i tie them.
Eunan