So you want to make a level? That's awesome! If you follow this tutorial you're level should look pretty good.
Starting Off:
To start off I'll be making a good concept of what I want it to be like. I won't bother with details yet. As almost everything is made, it starts off with a good foundation.
Getting Outlined:
Time to add some layers to grass and a bit of details. Nothing big, but finishing off your foundations.
Adding Details:
Now it's time for the fun part, the detailing. Try not to do it too much, as it can wreck the level. This should really lighten up your level!
The Finishing Touches:
Alright, to finish this off we'll add some more tiles that are harder to see, but really make it nicer. I've used some cut down grass and some other non-blocking tiles to spruce this up.