OP, you have a nice eye for colour and I can see the look that you're trying to achieve.
If you'd like some practical advice:
When you're composing your shot, try moving around. What happens to the image if you kneel or even lie down, if you stand on something to give you more height, if you move closer or further away?
Take LOTS of images of the same thing, moving the camera around to achieve different framing. Most of your photos taken in this way will end up being discarded, but often you will discover an interesting angle.
Always scan around your image in the viewfinder before you take the photo. Check whether anything is being cut off. Has anything strayed into the edges of the frame (tree branches etc)? In your shot of the water/lake, there's a little section of wall in the bottom left corner, for example. That's not awful, but maybe you could have moved the framing up a little bit (and also captured more of the dramatic sky).
Read as much as you can about light, especially golden light (that won't be so relevant if you're going for the summery nostalgia feel in your first set of photos, obviously). Photos taken at midday are usually not as pleasing or dramatic as those taken under interesting lighting.
Your black and white shots in the shed have a lot of promise. Do you know about bokeh and how to achieve it? It can really transform your images, if you like that style.
If you enjoy this then stick with it, and practice as much as you can. You're not shit, you're learning.