I'm going to come at this from the perspective of an experienced macro shooter/enthusiast. Also because I pity you, I know what its like to post macro images in the general section and see zilch feedback. Sadly, the macro sub-forum can actually be worse at times. Kudos to Photographiend for stepping up.
Lastly, if you are looking for feedback, limit your posts to two or three images,
at most.
1. Not a very strong image. Poor subject isolation.
2. Better, but why post this crop directly after the first image? Theres a simple rule to much of photography,
only show your best.
3. Not bad, don't see why you didn't crop this one.
4. Probably the best of the set. While not a true macro image in my opinion, you have a subject, and you have context. All of your other images are lacking in either these or basic composition.
5. Bleh. Tons of noise, and cropping has only revealed a lack of focus. Again, only post your best.
I'm not trying to be a self-righteous ass, I'm just being honest from the perspective of a fellow macro shooter. If your wanting to get some personal tips, or just want to check out some of my macro images for *cough* inspiration *cough*,
here's a link. While I've since moved onto better rigs, several of those photos were taken with a 55-250, so you can surely do just as good with your telephoto.
One quick note, if your going to do anything,
FOCUS ON THE EYES! Just like any good portrait, if your eyes arent in focus, your image is going to fall short of what it could be. Us macro shooters are lucky in that bugs usually have pretty neat eyes from the start, so work with it!
Lastly, in my opinion, if you really want to capture great macro images you need to approach them like you would street photography or portraits. Life is happening right before your eyes, in a world filled with so many incredible tiny creatures, all of which have their own personalities. Take some time to learn their ways, how they behave, their patterns, and then you'll be set to really nail down some images. Lastly,
be passionate! ​Don't present them like you would an object, present them as living
art!
Shameless plug for some of my favorite, more recent images. Maybe they'll help you out.
Mountain Beauty by
TogaLive, on Flickr
The Wolf by
TogaLive, on Flickr
What Lies Within by
TogaLive, on Flickr
Oh and here is an example of an image taken with a 55-250mm last year. When in doubt, simply look for bigger subjects! Carpenter bees such as this one make excellent macro subjects. In reality they are about an inch long, but the viewer doesn't have to know that
The Carpenter's Eyes by
TogaLive, on Flickr