I'm not great at grass either, but some really good ones tend to have larger areas of solid color with smaller hints of a pattern within the green.

You've got a pretty small bit of grass on this piece so it doesn't really matter, but here's an example (plus a showcase of a somewhat-popular palette people on this site tend to use) :www.pixeljoint.com/pixelart/64505.htm

I can only criticize am inexperienced at it myself. I think using clusters must help immensely, though.

Agent00X: "The grass is a bit messy, but the Skywater is perfect."

Do you have some tips for me, as I could make the grass better?

Great atmosphere! The light is pretty sweet.

ummmm, NPA shadows? 

Ohhhhh, the sea and the sky look great  (●'‿'●)

The grass is a bit messy, but the skywater is perfect.