That is great improvement from a shy pig.
And I think your pig is trying to "kiss" you (their lick)... you have to trust it to get its trust back so never be afraid that your pig will bite you unless you give it reasons to. My pigs kiss me all the time on my lips... such little darlings!
If your pig stretched out their legs & look relax, then you are doing a very wonderful job opening up to you. If they sleep with eyes closed while you holding them, even better (then they really really trust you)!
I was just surfing the web playing christmas song videos (a change from youtube showing
GPs) while having lap time with my piggies & guess what... all my piggies love it! They were sooo relaxed listening to the soft music & they love music!
Learned another thing new from them again!