This is my first test. I like the looks of it but given that this is the longest render i have had (excluding the animation) at 10m i am a little worried. Might have to cut back on some of the grass, seems a bit dense.
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Renders can take a while even with less grass, This was done last year so i forget the setting sas i since changed GPU but it was a 3 hour render.
To be honest i think the grass is fine on yours mine needed to be more dense. 
Yeah i decided to let it go whilst i went out to dinner. This is the result with less dense grass. Looks pretty good i think. This was 70 samples and took 2hr 55min using my Skylake I7 CPU. GPU doesnt have enough memory to do this stuff.
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This is my initial render from the fluffy bunny in grass scene.
Tab: Render
Device: (CPU) Intel i7-3770S 3.10GHz × 8
Dimensions:
Resolution: 1920x1080, 100%
Sampling:
Render Samples: 32
Light Paths:
Max: 150, Min: 8
Tab: Particles
1 particle system for the grass
Emission: Number: 25
Children: Render: 10
5 particle systems for the bunny
Body:
Emission: Number: 3250
Children: Render: 100
Head:
Emission: Number: 1500
Children: Render: 100
Ears:
Emission: Number: 750
Children: Render: 100
Chest:
Emission: Number: 250
Children: Render: 110
Whiskers:
Emission: Number: 6
Children: Render: 3
Total Render time: 26:47
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