I think they're cute for your first pictures. I can tell you're really excited about photography. If you're a novice just starting out, try browsing Flickr for some inspiration and examples of good photography.
This is a good group and directory of photographs of plants and this is a group for walls.
Some things you should work on are lighting and focusing. Light is different at every part of the day, so find a time where the light outdoors strikes your subject in the most interesting way. Also, be sure to hold the camera steady when taking a picture, to avoid the blurriness in some of your pictures.