cute shy type girl
in my beginning film photo class
talked to a couple times but i stumble on what to say
i know i have a chance
how do i approach and close in on her number without being too straight forward?
btw she likes the show weeds. dont know if that helps haha
thanks!

hhhhmmmm... she's probably an introvert.
If she likes to actually smoke weed instead of watching it, you might be able to use that.
First of get around to asking her if she smokes weed. Then if you smoke yourself ask her to smoke together, however if you never smoked in your life ask her how it feels... Usually weed smokers are usually lovers or haters.
So anyways for introverts, to avoid 1 word answers you need to get them talking about shit they like. For instance, if she really likes weeds ask her questions about it.
After she builds some comfort, ask her to give you her contact info just in case you miss class.

Street Geek hit the nail on the head.

However, I'd ask for the number in a different way.

If she shows enthusiasm in the show, smoking weed, whatever, just be casual and straightforward: "Oh cool! Hey give me your number and let's do/watch______sometime."