Nice rocks and overall a nice composition, especially for a beginner, well done.
I'd make the trees lighter/more visible, and up the quality of the clouds.
The trees appear to be either very small or very far away (Peter Kay joke

), which makes it hard to determine the correct scale of the scene. Are the trees very far away but with huge rocks in the foreground or are the rocks medium/small size with tiny trees close by? Hard to tell.