this one's a little bland but there are parts of it I like. His bottom half is a bit dodgy, something to work on in the future
Also the sense of perspective seems off now that I look at it. Those doors are supposed to be pretty big. Oh well...
About the scale, i think the problem is that you have very small trees in the foreground, no middle ground reference, and a background with trees of undetermined scale. Then you see the foreground trunks, and assume that the ones in the background are the same size, meaning that the door looks tiny. If you make the trunk in the bottom right huge and going out of the scene and add some large trees in between the character and the door you'll give a sense of scale for the doors.
Can't wait for more paintings from this series. I love the story you're telling!
The trees somehow remind me of the Tunguska incident.