Thanks for the helpful suggestions!

I added a gate (big oversight) as well as some cart tracks, turned the bushes a little and added some weeds behing the outhouse. Couldn't find a chopping block symbol I was happy with, so I just kept the firewood pile with the axe.
Not having stall walls between the 'seats' was intentional, because I think in a medival/fantasy only high class establishments would have that. But that's a matter of personal mapping taste, I guess

So, here's my final version (at least I hope so). I have one with a grid too, but this one looks cleaner.
Outhouse_NoGrid_Small.JPG