Only thing I can think of is to mess with the tractor a bit. Maybe push it into the ground a little? Most of the tractors I've seen have a lot more squish in the tires.
Lookin good! I always wanted to do a farm, just haven't had the space.
Sooo many details to add now, laundry hanging, picket fence, old junk. No limit really!
power poles
an old beatup farm pickup
clothes and a clothesline
a well or well house (can look like a shortened out house)
a storm cellar (build up a little mound near the house and put a door on it)
a small flower garden
maybe another tree or two around the house.
What a pretty farm house! I like that shed, too. Looks like you made it board by board. I think a few chickens scratching around would be a good idea. Nice scene.
I like it. Good job on not only the scenery, but placement of the buildings as well.
While we're giving you a list of things to add, remember not to add too much stuff, otherwise you'll lose that "wide open" farm feeling.
That being said, an old boxcar or rundown wood coach might make a good chicken coop. Maybe add a little "area history" by using an old interurban car from the line that was torn out in the late '30's.