I think you look beautiful and extremely stylish - I just love your style! Always look forward to seeing your posts.
Don't worry too much about feeling funny about perceived changes. Having said that, I don't see any difference at all, and agree with others that it's most likely a case of lighting etc.
At the same time though, I don't want you to get a complex if you notice something slightly different - this doesn't mean there is anything wrong for noticing changes, and it doesn't always mean 'disordered' thinking, imo.
Just the other day I noticed something that looked like a pimple on my chin. I haven't had one of those in years and years - the fact that I noticed doesn't mean there's something wrong with me. It's no big deal...just that maybe I want to use some cream or toner or something to clear it up.
It's not what the changes are (if any), but rather - what we make it mean. My favourite response when I get weirded out by things like this?
"Yes...and?"
The fact that I might have a pimple on my chin doesn't mean anything other than maybe I want to use some special cream or toner. It does not mean there is something awful about me. Same is true if I gain five pounds (or even more). It just is. It's just information, nothing more.
While I can't see any difference in your collarbones or calves (other than different lighting, poses etc.), even if there WAS a difference, what would it mean? You're still beautiful, smart and super-stylish.