Love the motion blur gives great atmosphere to the shot. There is a second possible composition; which is the top half excluding the cluster of people at the bottom, giving a landscape format. I would be tempted to tone down the pink jacket at the top right and clone out the buggy at the edge of the top.

I like this photo it is very striking and immediately grabbed my atentionas I was flicking through. I think V1 is definately best. I have uploaded a modification. Part of the problem with infrared can be the contrast and the dynamic range with all the white folliage. One way round it which to an extent replicated the "glow" of Kodak infrared film is to duplicate the layer and apply a Gaussian blur to it. In the mod I did I used a radius of 9.5 for the blur. Then reduce the opacity of the layer to between 30 and 40%. This reduces the contrast and gives the glow. Before doing that I put in an adjustment layer to alter the levels for the sky to try and make it a bit more dramatic.

I've seen many picturesof Castle Stalker and they have always been in colour, generally on a sunny day. This is lovely and very atmospheric. I agree that a little more contrast may help. I would trim a little bit off the top. Without a trim the Horizon is a bit central. I have uploaded a modified one. I would have been very pleased with myself if I had taken this picture.