I'm led to believe that your flash fired with this shot, Adeline.
I shoot with shutter priority at a very fast speed, typically.
I would recommend that you do the same in bright light and see
what kind of results you can produce to improve on this shot
when you're using your long lens. If you had pulled back a little
from your maximum zoom, I think the light on this subject may have
improved based on my experience under certain conditions.