That's going well Ben. Nice detail in the first one and the DoF falls nicely with the whole head and body and the near legs covered.
The last one is tricky. Both the fly and the leaf are highly reflective. What you may want to do in such circumstances is to underexpose enough (and it may be quite a lot) to avoid anything blowing to white*, and then bringing up the shadows in post processing (probably coupled with an increase in exposure/brightness and a decrease in highlights.
You probably won't be able to underexpose and lift enough to avoid the metallic green taking on a yellow tint in the brightest areas on the fly's back.
* Not quite what I meant to say. It is a matter of judgement and visual preference, but you may want/need to leave some very small areas blown to white. It is the larger areas of white that personally I find distracting and prefer not to have in my images. YMMV of course.