I'm Luis and I enjoy digital painting, concept art, drawing, 3d animation, digital sculpting, etc. I really want to improve, and this seems like a good place.
General
A few months ago I started with 3d animation and this was my first model I will always remember it.
Try to have a reference when you're painting.
For example, your last mountain environment would have been better and more interesting if you would had looked at some reference before starting.
Look at the colours, the lighting etc.
For now I would say your environment are lacking in composition. There is nothing in the foreground, 3 mountains in the background and then a sky.
Search for the Golden and the Rule of third, it will help you.
You can also do a study of a landscape, and then apply what you've learned in a painting.
Keep up the work, it will come !
@Fincks, Thanks for the advice I'll try
Quick practice 45-60 minutes
I'm bored so I made these sketches