OK, First let me clarify so you can take what I say FWIW, not much. Ha! I am still learning and struggle with the different aspects of photography. I think I am getting better, but sometimes I wonder. Ha!
Anyway for me "Composition" is a very important aspect of photography, that I am learning, slowly. Color combinations ie complimentary and contrasting colors are other things that bring out a photo or make it stand out. The message you are trying to convey is another aspect. You have a new and great camera and seem to be eager to learn. Great!
Now to give you some questions to ask yourself (I have to remind myself to ask the same questions).
1. What are you trying to show in your photo?
2. What is the theme?
3. What is the main subject or focal point you want people to see?
4. Then how do I accomplish it?
There are snapshots and there are photos. Please don't take this wrong, but I consider your shots, snapshots. They lack (for me) any, for lack of a better term, direction. I am not directed to anything in particular. It is flat. You did do a pretty good job bringing out some color in your post processing, which is part of the learning curve (I'm still on the uphill climb of that curve.)
I might suggest that you look at similar photos (on this forum or on the internet) and see which ones you like. Then study them to see how you can get your shots composed, etc in a similar manner.
As I stated in the beginning of this post, take this with a grain of salt. I mostly shoot birds because I have problems getting what I want when shooting scenes ie landscapes, etc. Birds pretty much compose the shot for you. Get the shot with some room to spare around the edges and then crop to bring them out. Ha!
Answer the questions on this picture you posted as to what you were trying to achieve and I know someone will jump in an help (And probably will point out all of the areas I am all wet in. Ha!)