Unless your game is using a camera pointing down at a 90 degrees angle to the floor, it would probably be a good idea to add some overlapping grass blades (for depth) and additionally you could also "lift" the two lower grass blades on the "X"s. This will add a nice perspective to your pixels.
Concerning the tiling, I think you did a pretty good job on hiding the modulation, except for the horizontal darker lines, as Xion has pointed out.
I could make an edit if you want me to, because my crippled English might in the way when I'm trying to explain something less obvious.