"the third installment"
source code time again ^.^
"lightly brushed paint" uses a similar tactic to room 1, where the first letters matter, so we get "LBP", short for littlebigplanet.
it also asks for the third installment, which is littlebigplanet 3. let's go to the specified .htm page.
"it seemed rather iconic for extraction"
mmm yummy source again ^.^
now we need to get images from hashes, using maticzpl's lbpfind.
to start, we locate the location of the icon images, which look a little something like this:
icon.php?hash=[hash goes here]
doing that gives us a series of images of letters...
...which gives us our next answer: empathetic.