For a point-and-shoot, I am very impressed with the macros (especially the dandilion).

The first one feels a little underexposed to me, but that may be due to the lighting (and I'm assuming you can't adjust the shutter speed or aperture on your camera). Furthermore, since you have a point-and-shoot, I'm assuming you can't adjust the focus. Parts of the plant (closer to the bottom) are a little unfocussed, but you could probably have easily fixed that with a camera that doesn't rely on AF.

The grass in the puddle picture has excellent composition and it looks like the sun was cooperating.

For the picture with the sun smack in the middle (sunset), the cloud cover kinda hurts the natural lighting. I would probably up the exposure time by decreasing shutter speed and increasing the ISO sensitivity.

All in all, you have some good ideas for composition here and like I said, I am fairly impressed with those macro shots especially considering your camera.

Although I agree that artificial-looking photographs can be bad, I do believe that there is an art to manipulating pictures and still make it look good and natural. Overall, I think you've got some good ideas going and you could really benefit from owning a real camera.