Well, the set look comes from the uniform lighting - granted, you don't want it to look like Wrigley Field at high noon, but the soft, gentle sunbeams streaming through the tree branches as the clouds move overhead... wait a minute, when did Bob Ross hijack my keyboard? Even so, even having the slight presence of light (say moving through the tree branches in the background to give life to some of the background mattes, as well as have light changes over the foreground characters - nothing dramatic, but things like Yoda sitting on the log with the light getting slightly brighter and then darker [no direct beams of light] to account for light changes as it goes through openings in the clouds above). Subtlety being the key.

Regardless, I still think that perspective (the X-wing looks a little too small, or the trees don't recede enough from background to foreground - maybe its that little stretch of horizontal land right below the X-wing that is screwing the persp. up) as well as a specific environment around the X-wing need to be worked on; for example, a path needs to be created behind the X-wing to account for it crashing into the swamp water. If when Luke tries to raise it up, we see a bunch of trees behind the X-wing, that would mean Luke would have crashed into a bunch of trees as opposed to into the swamp.

Angel:
on one last note, I like your previous X-wing lifting shot a little better - the new one probably meshes better with what we saw before, but it still has a set look in how enclosed and specific the line of trees are. The former shot, while the lighting could be toned down, is a LOT more opened up.