It looks pretty good overall. I think that there are a couple things that you can do to bring out the sense of space in the picture.
1) Try to have a foreground, midground, and background. You seem to have the mid- and background at the moment but no real foreground. Having a foreground brings the viewer into the picture more. It could just be some branches or leaves poking up around the edges of the picture to give the impression of someone peering through the brush. The foreground is always very dark in value compared to the midground which is again dark compared to a very desaturated and light background.
2) Really accentuate the difference in values between the fore-, mid-, and background. If something is behind something else make it lighter, even if what you are lightening is a part of an object in the same plane. This helps to give a better sense of space. For example, the three central trees should be lighter than the two outer trees as they are further away from the viewer.
3) Make the focus of your painting large. It's hard to keep a person's attention on a small focal point. You do a good job, however, of using the angles the trees are leaning to guide the viewer's eyes towards the monument/tombstone in the middle. A good test to see if your painting reads well is to zoom waay out until the picture is no bigger than a thumbnail sketch size and see if you can still understand what the painting is trying to communicate.
4) It's a good idea to include something as a reference for size. You could have a bird or some other wildlife that the viewer can use easily figure out how large the objects are in the picture. It can also serve as a way of indicating space if you include some that are large and close versus small and further away, as our ideas of space include the size of similar objects. Using this it can allow us to judge the actual size of the objects in the scene. Right now I'm asking myself, "Is this really a mammoth monument in an ancient forest with enormous trees? Or just a small tombstone with three normal trees around it?"
Hopefully, that helps a little. You're definitely on the the right track. If you want to explore what I've talked about more, you can watch Feng Zhu's tutorials on youtube or his site. I really have learned a lot from watching them and I can't recommend them enough. Here's his school of design's website -
http://www.fzdschool.com/free_tutorials.htm.
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