I tried this for myself now since I had a hard time understanding what the difference is.
Anyways, I shot similar photos like you did, quite alot of black things in the photo. And my ones look just like your locked bootloader ones.
My phone has been unlocked once but is now relocked with flashtool. Meaning I don't have the DRM keys present.
Stock firmware,.757 and not rooted.
I haven't tried this with UB though.
Sent from my C6903 using XDA Free mobile app
OnePlus One Black Sandstone edition 64gb - Stock
Xperia Z1 - Stock kernel - .108 - Unlocked Bootloader - Rooted - Has itīs own life
Xperia V - New display and working like a charm.