Keep practicing using different tiles to make different effects like when making houses, use different path tiles to make the path less straight, dont put tiles with green around it on sand tiles (ie flowers, swamp tiles, rocks, etc...), try not to use pre-defined objects, use the tiles and put things toghether instead, dont just copy and paste the same tile over and over again all in one area (as in swamp tiles).
If you keep working at it, you can become a good level maker
