Welcome to the forum. One thing, when you post images here, please number them as it makes it a lot easier for a reviewer to refer to them. Thanks.
My first impressions, FWIW...
#1. The grass in the scene covers up the mushroom and thus makes it cluttered. If it were me, I would have pulled the grass out - no its not cheating - so that people would get a good view of the mushroom.
#2. Not bad if this is a first try. The crop is a little tight. I would have liked to see the entire leaf that is cropped off in the bottom of the image. The background is a little distracting. You can fix this to some extent by using a larger aperture. Nice effect with the water drops though.
##. Again, nice image with the water drops. I would be better if all three of the clover leaves were in focus. Even better, if the one didn't have a big "bite" out of it.
You will probably want to read up on composition. If you Google "photography composition" you will get more hits than you can read in a month. As well, Bryan Peterson has published two books you might want to look at: L
earning to See Creatively and
Understandig Exposure. Make sure you get the most recent editions of both books - you local bookstore should be able to help you with this.
As far as web stuff goes, have a look here:
Photography Composition Articles Library . As well, there are a series of web articles on composition that start here:
Advanced Composition -- Part I. You will find a link to following articles at the end of the web site. There are, of course, thousands of web sites on photographic composition.
As far as editing and editors go, there are lots of them available for free -
Best Free Digital Image Editor and if you are going to buy an editor, then check on applications like Photoshop Elements and Lightroom.
Cheers,
WesternGuy