Some nice photos, you seem to be on the right track. Now you just have to try and move away from conventions, while keeping the photos interesting. I see you are using a prime, this is a good idea
Photo by photo, my thoughts are:
1. Busy, but interesting. The odd colours and contrast, the foreground and background.. it kind of works, keeps the eye, even though there is no specific subject (the sun, the clouds, the branches, it all comes together, but no single thing takes the place as "subject"). Probably my favourite of the bunch
2. Good idea, I just wish more of the flower were in-focus
3. Interesting, but sort of has been done, and the lines aren't parallel
4. The portrait is okay, though it probably means more as a memory that was captured. Not sure if eyes are in focus, but those are difficult light conditions to take a crisp photo without tripod or flash
5, 7. The animal is nice, has an interesting expression, is focused, but the background is a little distracting
8. Would work, interesting wall and door, but lines are not parallel. I know that this is a little thing to nitpick about, but generally you will always want lines like that to line up (at least the horizontals). In an en face photo you will want the camera to be straight, no tilted. Thats the difference between a photo that is fine and a photo that is great.
You have the eye for general composition, but you need to work a little more on the details, like backgrounds. The K-r is a great camera for learning and using prime lenses will speed you up on your process.