I decided to do a landscape to get back into the swing of drawing since it's been a while. The lava isn't well detailed, but I drew it in about an hour.
I think you need to work on composition. This picture, as-is, is rather bland and slightly uncomfortable to look at.
A few pointers:
The mountains and sky which encompass the majority of the picture are very blurry and undefined, whereas the grassy beach(?) which encompasses only about a fifth of the vertical space is very detailed and fine-grained; this makes it uncomfortable to look at because it seems like you've tried to make the mountains the focal point of the picture by having it occupy the centre-stage, but at the same time you've drawn it in such a way as to make it insignificant. Simply put - don't be sloppy; make up your mind on what's important and draw detail accordingly.
Pick a clear focal point, and "draw around" that; the subject should stand out and everything else should be subordinate to it. If you don't have a place for the eyes to "go", your picture becomes confused. Professional photographers are great at this stuff - If you look at
this and
this, they all have a clear, simple subject/focal point, and everything else is out-of-focus or very clearly not the point of interest (if they're even better, they probably have great bokeh too). Remembering this hierarchial view of composition will help you.
Here's an album of photos from the same photographer that have very good composition and are for the most part clear examples of this.
Vary your palette.
Make use of the
Rule of Thirds. There is much more to decent, artistic composition than that, but this will help you loads to begin with.