Very nice digital matte extensions of Dagobah vaderios. They do a lot to add depth to the exterior shots.
As BarBar Jinkx pointed out, though, in the shot of Luke looking back at Yoda, just before he attempts to lift the X-wing out of the water, wouldn't there be an open space behind the ship? Refer to the first shot you showed us of the X-wing just after crashing... there's a ton of open space behind the ship where Luke put her down.