Hey bichio,
Cool photos! I do have some suggestions for you. #1 is my favorite of the bunch, but the white balance seems really off in this one. There's a cool/magenta hue on the photo, so a little adjustment in photoshop would fix that.
#2 is cool but it is way underexposed. Another adjustment that can be made in photoshop, but best done in camera when taking the photo. What mode are you shooting in? Manual, auto, av tv...?
#3. This one is pretty cool but the light is really harsh on it. It helps to have some sort of diffuser between the sun and the subject, but that usually requires another person there to hold it for you.
#4 & 5. These are my least two favorites, they are both pretty soft. It may be your focus on the 4, or it may just be the bug moving and your shutter speed being too slow. It looks like on 5 you may have zoomed way in to the image after it was on your computer. It looks like you are at 100% and that's generally not that flattering in any images.
#6 is nice. Nice frame up and lighting.
My $.02
Keep shooting!