yeah just need a higher res non-repeating texture. you will find one eventually, there are a few around. I would say your renders are underexposed. Sun just doesn't seem bright enough, this will improve them immediately 4th image you posted for example, grass reflects a sunny day whereas the house looks underexposed. Simple post pro or tonemapping in render engine would help.

Looks good. I am not a render guru, so I can't give more feedback than that.

Looks remarkably similar to what my first cars looked like