There is a lot right with the way you tied this fly. The wing length is good, tail length is good, fairly sparse dubbing, jungle cock is oriented well as it runs in a straight line from head to hook point, and nicely sized hackle on rear body section.
Here are some suggestions to make your next dee even better:
1) Make the rear body section shorter, about 40% of the total body length. This will allow the front body section to be 60% of the total body length and make for a much better balanced fly. The reason for this is the throat, spey hackle, jungle cock sides, and wing tie-in all contribute to the front body section being smaller than 1/2 body length. By making the change suggested on the length of the rear body section, this will be taken care of.
2) The jungle cock is too long. Jungle cock sides on dees look best when about 1/3 the length from tie-in to end of the feather.
3) The oval tinsel is not tight against the rear edge of the flat, and it needs to be. The oval tinsel should look like it is melded to the rear edge of the flat tinsel.
4) Both the rear body hackle and the spey hackle need to have the stems tight against the rear edge of the oval tinsel.
5) The duck flank throat would look best if the side against the hook was stripped. Doing so ensures that all the fibers flow back over the hook. Some of yours curl forward, a no, no.
6) You crowded the head. Leave a small space with nothing on it at the front of the head before the hook eye.
Make these small changes, and your dees will make a major improvement in how they look.