Awesome pictures! Thanks for posting them!
I wish there were some of the HK433 latest version. All I've found is some from Concamo, who have been helpful with getting some photos. I'd contact them on their site or on Facebook. It might take a while for them to get back to you, but it'll be worth it and they'll be extremely helpful when they contact you.
A few of the 433 in black
Those aren't of the newest version, though the older versions are probably the easiest to find photos of, especially from HK. Concamo did a photoshoot with HK earlier this year that showed the 13.5 and 16.5 inch barred versions of the newest variant. Not too much is different internally, but the charging handle has been moved back to be similar in position to the FN SCAR. Kuma Tactical also did a video earlier this year featuring the 11 inch barred variant. Video is in German but you get some nice visuals of the features of the rifle.