Three very different images.
V1 using the aperture of 3.5 unless it's my eyesight (quite possible) the far distant trees could be a little sharper in my opinion, the fore and middle ground are fine. I found that it's a lens that takes a bit of getting used to especially if you playing with large aperture settings. Depending upon the height of your tripod, if used at 'normal' height a tilt of less than 2 degrees I find is often the best. I find it best to focus on the foreground and then tilt for the distance check the foreground focus again and make little changes so that the plane of focus is throughout the image. The nearer your tripod is to the ground requires more tilt.
V2 you have handled the shift well and I like the image although I might consider brining a bit more contrast into it. I have also found that on my D800 an aperture of f13 works well and I would only use f16 if my foreground interest is very close to the camera.
V3 works well in mono and shows the versatility of the tilt/shift lens when used like a lens baby to get the toy effect..
One word of caution when using this lens is that although it cost an arm and a leg the locking screws can be easily disturbed and with time can become quite loose even when tight if that makes sense, that's the downside that you have set everything up composed the image, focused and then you want to use a filter or polariser and as you fit it the tilt moves and you have to start all over.
It is a great lens so have fun and experiment with it but it can and probably will frustrate you initially. Sorry if I've gone on a bit.