I'm not sure what composition training is haha but I really like the calm and nice feeling you have made with this. I like how even though there are few objects, you somehow made the depth and space of the image very apparent, with the cliff in the back over the ocean. The palette is really amazing too, just reminds me a lot of foggy mornings in the countryside. But what I find most impressive is when I scrolled down to write all this I saw you wrote you drew this with a mouse, that's crazy! That stuff is so hard to do... Great work in general though, keep it up!