These look like an excellent start! I'd say first impressions is that you havent got much saturation or vibrancy in the foreground which make them seem a little flat. The colours in the third picture seem more vibrant and this is my favourite.
The thing that absolutely changed my life with painting was understanding notan-this is the idea of creating good compositions by planning paintings with only black and white simplified shapes to ensure they are attractive to the eye. All the old masters used this compositional style. Often it results in the rule of thirds- 2/3s dark vs 1/3 light or vice versa.
You can go further with it with and ensure all lights and darks are linked so you can direct where the eye goes.
If you look at Sarolla for example all of his lights are beautifully linked drawing your eye through the painting.
I also advise genuinely planning your paintings. It's a small step but gets you thinking about composition. Do a series of notan sketches with the lights and darks emphasised in different ways to find the most pleasing, and sketch a plan of where things will go.
Mix your paints in advance to avoid muddy colours and load you brush frequently and place the paint in one stroke, leaving it there with no blending or rubbing or fiddling.
You will find things look far more 'painterly' if you are brave with your paint placement.