With respect, while Dylan is a 'nice' shot, the image itself is tonally dull, with little detail in the fur, noise causing loss of detail and a general lack of crispness. Careful processing of the RAW file should be able to bring a lot out of that image and give it sparkle and punch. I don't know if you have shown the jpg or result of raw processing here, but you *should* be able to improve this quite a bit. But high ISO on an older crop camera is always going to make a bit of a mess - iso 6400 requires very careful management to create an acceptable image on my D610 with FX sensor, and I avoid using above 800 because it simply reduces dynamic range and smears detail - 400 is the normal limit when I'm using my Sony crop.
If you don't mind a little crit (presumably why you posted here) the first 3 images are a little dull & could use extra contrast, clarity and work on the dynamic range, while the last 2 are a bit lurid. The bee in the last image really needed to be in focus, since that's the whole centre of attention in that shot. Of the set, the first image is the strongest, with sharpness, movement, good composition and interest.