If you want the focus to be the x-wing, here is an idea:

Being that most critters would flee away from something crashing into their quiet, tranquil swamp life, you should see creature flying away from the x-wing initially. You have the right foreground with a 100% to 90% fog bank, which dissipates to the right (like it was moving from the center of the lake and moving towards us at an angle), which would then reveal the spider slowly/cautiously crawling from the right to the left. The direction of the spider's movement would move towards the X-wing in the distance, as well as inflect a creature that had already hid itself from the X-wing crashing and now cautiously coming out to investigate.

Besides... there is nothing saying that the spider cannot be seen in a later Dagobah scene (if not this particular one). I think if anything, regardless of whether this stays or goes, as a proof of concept it is still quite excellent.

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As far as the side shot of R2 right before and during the entry of Dagobah's atmosphere.. yeah, you should probably see the wing behind R2, going by the pictures of one of the movie used models here:

http://www.starshipmodeler.com/starwars/smith_sw.htm

Even so, I can't say it ever bugged me, as the focus is on R2 and we get enough visual information to know that he is in the back of the X-wing. It would still be a neat thing to see though, even for a mock-up (Ronster).

Anyone have a 3D model of the X-wing so you can literally zoom in to recreate the R2 shot?