First, I should say that I'm no expert! These are just my thoughts - I figured if I asked for critique myself, I should at least try to offer some.

Here's a quick edit. If you post a .png, it'd be easier to do something more accurately.
Overall, I like it. It does give the impression of depth. The palette looks like it's a grey, rainy day to me, which is cool if that's what you're going for. In my edit, I circled some points in the background that appear to need refinement to smooth out the line, as the jagginess sticks out. I added a bit of your shading colors to one side of the rows, to try to create a sense of depth between them, and establish a lighting direction - I'm not totally sure it works as I've done it, but I think something like that could help. Also, the tree looks like it's just floating there, perhaps add a bit of shading in the grass around the trunk? I can't directly comment on the texture, like you'd asked, partly because the .jpg-iness affects the texture you have now. I also have tried to do something like you're doing now in the past and struggled with it, so I'm looking forward to seeing what you come up with!
EDIT: I just realized that you did post a .gif of the front row, whoops! - I'll take another look at it soon.
2nd EDIT:

I added a highlight to give a stronger direction, enhanced the shading on the lee side, used a bit of dithering of the darker accent to try to shape it and give a bit of a rougher texture. I also flattened the angle of the rows, which garbled the edges of the outside two rows a bit. Definitely still a few of my mistakes still in there, but perhaps it can help you a bit. I agree, at this scale, it's hard to show stalks - I tried unsuccessfully. I also added some variation on the lee side shading to try to give a sense of the varying height of the stalks - I don't know how well it comes through though, perhaps it would look better with a bit more contrast.
Cheers! I enjoyed this little experiment.