No, they're not too bad. A few thoughts:
1. A nice composition and good use of selective focus to concentrate the eye on the main subject, however, I'd suggest that cropping closer to the actual water droplet.
2. Interesting, however in this case the composition isn't, IMO, ideal. I think that this might have been better by getting down lower and shooting toward the tortise (vice down from above), or opening up the field of view to include all of him.
3. Again this would be much better if the frog was looking at us. Fully understand in this kind of image you often have to take what you can get. I would suggest a tight crop to concentrate the eye on the frog, and eliminate the large, unfocused leaves image left and upper right.
4, 5. With flowers it's generally best to shoot down onto the blooms vice across them, and to compose so that a bloom or small group fills the frame.
Overall, good work. Your exposure and use of selective focus shows a good understanding of the technical side, just a little more work on the artistic side.
Just my $00.02 worth - your milage may vary.
~John