6 - Bug on Leaf (I was going to say 4, but I couldn't get over the colors in 6)
The red may be a little bit washed, but the colors and contrast are great, especially with those white veins. The blur on the background looks good, and that bug is cool (now just add an investigating Pyro shadow next to him and you've got a world-beater
![Wink ;)](./images/smilies/icon_wink.gif)
). The only thing that detracts from it is the chromatic aberration at the top of the leaf.
Using the process of elimination...
1 (first I was thinking that the blur on the front-right paw wasn't good (too blurry), but as it is an action shot I might be wrong there. the grass in the background is a little grainy
2 & 9 (Ladybugs are really neat pictures, but unfortunately they suffer from being grainy, and the focus of 9 seems to detract from its appeal)
3 (really nice color on the background, and probably would have been my choice if it weren't for the varying focus on the ice crystals)
4 & 5 (either of these would probably be a good bet, particularly 4: except for the sparrow's tail and right foot the focus is excellent, and I like the contrast better)
7 (nice colors, but the double image detracts from it, and the berries aren't that interesting)
8 (grainy background, decomposing apples, and the butterfly is kind of on the plain side)
Between 6, 4, 5, and maybe even 3, I would say it may depend largely on your audience.
All criticism aside, those are really nice photos. What camera are you using?