I like them as a start and they're not at all bad given an asbence from Graal. As has been said however, there are many problems with them and they can be severely fixed to be far better.
My suggestions:
1. Go with one type of path detailing. The black-edged and green-edged tiles look pretty bad when people try to mix and match, as they're blatantly obviously not meant to go together. I prefer the green-edged myself as I think they look better, but whichever way you go I think you'll be better off using just one or the other. Otherwise however, the layout of the dirt (path?) areas is wonderful, beautifully chaotic.
2. Structure your grass detail. You've used a good selection of tiles for detailing but there's no structure there, just a random spray of detail and grass across the level. Grass clumps in real life, so show that in your level. Add some solid clumps of grass tiles together with a spray of the other stuff (flowers etc.) for variety. Again, I think it'll look far better and fill the space better than a random spraying.
3. Fix your cliffs. Don't be lazy, cliffs don't have to be like mine or Wan's to look good. Mix up the shape a bit and add a few little kinks here and there. It's not too hard to add a few bits sticking out a tile or three. It'll add far more variety and look a good few times better.
4. Fix your tile errors. Nothing specific here, but just take your time making levels and give yourself a minute or two to review each corner of the levels you make to check for errors. Fix them up, show some care and you'll find the levels looking far better.
In summary it's a great start but it is rough around the edges. Think a stone sculpture that had been roughed in and currently looked like an aborted foetus where with a bit of attention and refining could look like Alexander the Great (depending on your tastes

). Hope this helps and you should make more - you've got a good base to work from!