Not too bad. The first photo of the flower + spider is a pretty straightforward look at a flower. I think there's too much space left at the top of the frame though, and for web display I think the image needs more unsharp masking applied; this is a tough issue though, and depends on web hosting and re-sizing algorithms, final display size vs hosted size,etc,etc.
Your second shot of the waterfall with the small bridge at the top of the falls is suffering horribly from bad chromatic aberration; whatever the sensor/lens combo you have is not working. The photo exhibits the classic symptoms of a wide-angle lens that has poor control over chromatic aberration; the edges of basically everything in the frame have a faint fringe. Your lens is killing an otherwise beautiful photograph!!! Your composition is good, and the vantage point and the rainbow are all excellent--it's just that the lens's CA is killing this high-detail photo. This is where a top-grade lens would have improved the photo and made a truly superb shot just come to life.
The third shot looks sort of post card like, but the composition is not quite 100 percent maximized. The tones and colors are nice enough, but the balance of mountains and trees and foreground is not quite perfected yet. It is though a lovely scene.