Look nice, i can fill distance in the field.
may be use custom texture for grass.
Create New Image 1024x1024 -> Fill with green color #486e3e (or what you desier) -> create new layer -> fill with samer color -> Filter/Noise/Add Nose set to monochromatic, Uniform, 400% -> Filter /motion blur (angle 0 , distance 5 pixels -> in layers set Color Burn and Fill 38%
Now you have your grass texture.
You can decrease leight in motiuon blur and chande angle to 90. or add additional layer, play around with settings.
When you create terrain material from images be sure set bump to 0, and increase terrain maping size.
here is test image.