Infrared portraits are hard. You can’t autofocus, and you can’t see through the viewfinder to focus… it takes a bit of guess work when you’re up close. Helps to have a wide lens, preferably an L lens if you’re shooting Canon, as they have the IR focus offset marked. Let the autofocus pick a point and then adjust… yep, it’s a pain.
There is some odd 3D effect going on that i really like, could well be that it’s from shooting the lens wide open (ƒ1.4) and the subsequent lack of depth of field. Guess you don’t really see that in good light so much.