I don't like any of these. I do NOT mean to be harsh, I want to offer you some constructive criticism.
In general, LaFoto is right in suggesting that you spend more time thinking about composition. The way you frame a shot can help you tell the story.
1. The Yellow Flower.
In this case, having it centered makes sense. However the background is distracting. What might be a really cool juxtaposition is the beautiful flower in front of the hard brick wall. Could you have moved to your right a little, and filled the background with the wall? The shot might work better in Black and White, btw. The background color is very close in intensity to the flower, and they compete a little.
2. Couple in front of the Lake
A classic shot. But please, don't cut off her hands, it's nicer if they're fully in the frame. The light is waaay too harsh, both of them are squinting, and the high-lights of their skin is unpleasant... but sometimes you just need to get the shot when you're there, people want memories from a fun trip.
3. The Sunset.
Not an easy shot to get, it takes practice. The light meter red the sun, declared it extremely bright, and the exposure so that everything else turned too dark to recognize. A simple (though not perfect) solution would be to meter for the dark landscape, and then take the shot. You can do that by pointing the camera at the dark area, and then locking in the exposure - usually done by depressing the shutter button halfway. There's also a button on the back that you can use for Exposure Lock. The other way would be to use a tri-pod, and "bracket" the shot. It's a built-in function of the camera, check your manual. It means the camera takes three or more shots at different exposures. You can then merge these images using various softwares, Photoshop for example. I can't give you any compositional advice, as I can't see what's in the shot.
4. The wooden structure by the water.
I think there's an exposure problem here - again, the camera metered for the sky, which made your subject so dark that you lost detail. But might you have metered for the dark wood, the sky would have been blown out to a clear white. But the extreme JPG compression here is a real problem. Look at the weird Halo-like effect around some of the dangling chords and other areas of the wood. Also, whatever detail may have been in the dark was simply discarded by the JPG algorhythm.
5. The Ducks
Good shot. Well composed, and well metered. And who doesn't like Ducks. Try these in Black and White.
6. The stag.
Not a great shot. Yes, it's some kind of wildlife we don't see in the city much, but this is hardly majestic nature. It's some odd-looking antler thing slinking by a campsite parking area, head low and caught in mid-gate. Just like shooting people, track the subject and think about when it's going to put its foot down at the bottom of the step. It's like fashion photography. Models walk with a steady gate not only because it looks cool and commanding, but also so that photographers can time the shot - a person looks best during walking if the leg is fully extended. It's harder to do if the subject has four legs

Also, the antler is hit by too much sunlight and blown out, this might be fixible if you burn the image. Look up "dodge and burn" to understand what I mean.
Good luck, keep firing away, and come back here for more comments.