How much can I sell these art works? Can I actually sell these?

[*+=trouble maker=+*]

I've been painting/drawing since forever lol...but I don't keep them...either I give them away or throw them away... Let's say I don't like arts(?)...dunno...ironic?

Can I sell these? It's acid free, 9X11.5 mixed media paper...I've never sold artworks before, so I have no idea if I can sell these even if they're not on canvas...

if yes? How much do you think based on the size, the acid free, mixed media paper, and "visual" quality of these? These are acrylic paints(Gold Brand) btw.
Some say that I should also price the amount of time/effort I put on a single painting...how's that? I did the 1st 3 paintings within 30 minutes...not sure if it's a good thing or not...
Pencil/Charcoal Portraits, 2 hours max.


Paint:
1. https://scontent-a-lga.xx.fbcdn.net/hpho...8862_n.jpg
2. https://scontent-a-lga.xx.fbcdn.net/hpho...0082_n.jpg
3. https://scontent-a-lga.xx.fbcdn.net/hpho...2423_n.jpg

Pencil:
4. https://scontent-a-lga.xx.fbcdn.net/hpho...8075_n.jpg
5. https://scontent-a-lga.xx.fbcdn.net/hpho...6538_n.jpg

Charcoal:
https://scontent-a-lga.xx.fbcdn.net/hpho...7754_n.jpg
I know I can calculate my expenses on the materials used...I'm just after the visual quality and "effort" to add
Btw, the 5th is not a pencil portrait lol, it is a painting (2 hours)...
in watercolor