Honestly shiela I don't see anything wrong with the way you have captured the shots for the last two. They certainly equal if not surpass many others I see. The common factor to both of those is they lack impact because they are low contrast. If the insects had been on different backgrounds they would be cracking shots no doubt about it.

And every one said, 'If we only live,
We too will go to sea in a Sieve,---
To the hills of the Chankly Bore!'
Far and few, far and few, Are the lands where the Jumblies live;
Their heads are green, and their hands are blue, And they went to sea in a Sieve.

Edward Lear
http://www.nonsenselit.org/Lear/ns/jumblies.html