I can crop it, but don't want to loose the size of the leaf to show how small these little guys are. Mainly the upper right Leaf.
But the upper right leaf is nowhere near the subject. The subject is the hornets, right? Therefore, they are all that matters.
Cropping in so that they fill more of the frame won't confuse people into thinking they are a bigger species of hornet. There are two types of people in the world; people who know their hornets and people who don't. The ones who do will appreciate a nice crop to show the detail of this species, the people who don't will just say "Oooh, a fly!".
Think about what your subject is. Is it the hornets, or the leaf? They are too far apart in the frame to be both and the composition doesn't compliment both.
Also, as the person above me said, the hornets are pretty dark - you'd be doing well if you get much more detail out of them. Try again but this time think about how you can make the insect the main subject in the frame while at the same time showing its size, if that's what you want to show.
To show size you could look for insects around rose thorns (but crop in tight), other bigger or smaller insects, close right in to the insect so you can also see the veins of the leaf, that kind of stuff. You can't get much of a feeling of size if your comparison is with another item several inches away.
