Really nice photos especially for somebody who is just starting to do photography a little more seriously. The main thing I probably would have done differently is changed the exposure of the last three where more detail of the flowers would definitely have improved the pictures over all. besides that I would have maybe tried, if possible, to put the tree as much as I could to the side so that it was just part of the frame of the picture, since lines (especially diagonal ones) can be very distracting to the eye. Besides the things I mentioned everything looks really nice.
