C&C macro of bugs

Hi all,

Recently I have purchased a set of kenko extension tubes for my 60mm EF-S.

Playing with this new addition to my kit, got me playing with flash lighting as well.
At this point consider my shots presentable, and ask you to C&C.

There is one thing i am particularly worried about. Comparing my images with extension to other extreme close ups (> 1:1) on the web, I think mine a a bit soft.

The bumble bee is without extension, the other critter is taken with 68mm extension.

Thanks for looking.