Not bad. A couple of comments. There are elements that seem distracting to me in all of these, namely the object upper right in the first, partial flower lower left and the area upper left in the second and the area lower right in the third. They all could be cropped to remove these things and the compositions would improve for other reasons as well. The last probably is the weakest because it's a single flower shot straight on, so there isn't really anything to lead the viewer's eye around the image.
Looks like a good start - keep posting!