Hmm, that first picture is unknown to me, good find!
Where did you see it?
Another Brit picture to add to the list.
The second picture comes from the documentary Greg notes, 'Lost Sister'. It shows Britannic probably at Harland & Wolff, as some parts of the ship are not quite done yet(not that Britannic was all finished when she sailed out, but that aside).
The particular picture taken from a site called the OBRC, which does not exist anymore.
It's a stillshot(note the filmflash to the right of #4 funnel) from the documentary; that's why it looks like a filmclip.