Posts in Public Recruitment close after 14 days. OP of that thread most likely posted to recruitment, which then an LTC moved it to Portfolios and then unlocked it.
Portfolios are non-locking, recruitments have a window.
This all aside, I like OP’s art. Not much more to comment on it, but I always fancy a digital artist. I’ve had an interest in drawing but never really sported the skill set for that; rendering is my only future hope in terms of graphics.