Welcome! I'm sure you learned at least something using your compact in manual mode before switching to a dslr. That's how I started and I think it definitely helped the learning curve when I moved to a full-manual film slr. Those photos aren't bad at all. Yeah the horizon line is off and your compositions could use a little work, but that'll come with practice.
In the first pic (002_02), you made things a bit tricky by shooting towards the sun. With a single exposure from that angle, it's going to be impossible to have the tree, sky and ground all exposed well at the same time. When one is exposed right, the other two will be over and underexposed. So you'll have to choose one to focus on. In this case, the ground is the closest to being perfect while the sky is blown out and the tree is black, but it seems the tree was your intended subject. A photo of just the silhouetted tree against the sky would be an interesting composition.
The third pic (004_01) is a great example of how much your angle to the light source can change things. The clouds are a tad hot but, overall, everything is exposed fairly decently. The trees in the foreground get lost with the trees in the background, but you'll develop and eye for that sort of thing as you go.
The shallower DOF in the second pic (003_01) works well to highlight the bush. At the risk of blowing out the sky a bit and losing the tips of the branches, you may have been able to go a little brighter to really show the body of the bush. Again, it's tough to nail a photo against a bright sky with just a single exposure. You can experiment with combining multiple exposures by exposing for the bush/ground then exposing for just the sky and combining them in photoshop. At first glance the horizon line in that pic looks off, but the mountain in the background and the cement pillars suggest it's actually just a hill. Try lowering the bush in the frame a bit and it would be pretty solid composition using the rule of thirds.
Something that will help a lot with these types of photos is a Circular Polarizing Filter. You can rotate the filter allowing you to darken the sky a bit which will definitely help. Another plus is you can also use it to help lessen or even completely get rid of reflections when shooting shiny surfaces like glass windows.
I help this helps