1. Beautiful Landscape and composition. The image looks overexposed which can be adjust in the camera by using a polarizer and/or neutral density filter and if editing use levels, curves, and/or shadows/highlights. It looks a little soft which could be adjusted by a higher fstop and sharpening the photo in an editing program.
2. Beautiful flower and nice colors. The image looks a little oversaturated and soft. I would shoot in RAW if you could and use a higher fstop to get everything in focus. I would decrease the saturating a little and sharpen in photoshop.
3. I like the detail and colors of fall. The one thing I notice is that you might want to shoot the trees toward the skies so you have blues and there is a little contrast in the picture between the trees and outside of the trees. If there was something among the trees to draw your attention to I would see this photo in a better light.