Really nice, these !
In image 1 and 3 the focus seems to be behind eye level. Not knowing about the settings you used - nor the settings to choose from on a D40X - I am sure this will improve with the D7500, as it is a much better "weapon" in terms of AF capability and I think you'll love it. I've been shooting a D7200 using the same AF system as the D7500 and it was the best I had so far, before getting my D850, especially because of the excellent frame coverage of the 51 AF sensors. It makes it easy to compose the image while filling the frame and most likely having enough coverage to put the focus point whereever you want it. If you like this kind of shooting try to get hands on a 70-200 f4G or a 300PF and some extension rings ...
. I found both great for shooting close-ups with the DX body at that time. CONTINUE ENJOYING !!!