Hmmm... I make a try
Try and add different sand tiles. Now you only seem to use 3 different of them... use a bit more ^_^
Also try and add some other tiles to the grass, maybe some stones and things like that.
Make the pathway less straight... and try use different pathway to grass tiles.
Hope that helps... you can also make some small waterholes in the grass and maybe some sand holes...
Hope that helps you in your work
/Gori