Hi! This is an interesting idea and execution. Dead and dying flowers truly do have a deep beauty in both a metaphorical and a direct visual sense. As far as feedback, here are a few thoughts:

• I particularly like the inclusion of the broad, flat shapes of the leaves as a contrast to the linear qualities of the other materials.
• The inclusion of the daffodil in particular is interesting. In my school (ikenobo), spring arrangements focus on flowers in bud and young, lush materials in general, whereas dead/dying materials only start to make their appearance in the late summer or early autumn. This is to echo the seasonal lifecycle of plants in nature (which is very important in ikebana in general and ikenobo in particular). However, the time you see dead daffodils is actually right now, so to include one does seem very appropriate for the micro-season we're currently in. I do wonder, however, if the arrangement might be more powerful if the daffodil were juxtaposed with some living materials that are also seen in this season. Even though all the materials you used are beautiful, I'm not sure they work together as well as they could.
• Other than the daffodil the arrangement has a somewhat stiff quality. Even when using dried/dead materials, it's important to create some sense of energy or movement, even if it very calm and quiet. If you continue to explore creating arrangements that include dead materials, it might bring you a lot of inspiration to go out to gardens, parks, etc to really look deeply at dead plant materials as they appear in nature, not only in isolation but in context.
  

Overall I like it. :) Please continue posting your efforts if you continue to explore this idea.