Hi guys! I wouldn't be here if I didn't try researching the subject for a few hours but I need advice when it comes to canvas and acrylic painting. I have this huge wall in my room I want to do a painting for, approximately 4 feet x 3 yards. Anyways I know I can buy rolled canvas but my question is can I honestly just thumbtack the canvas on my wall pretty tight and just paint away? I'm doing this as a surprise for this girl I like and she's a really good artist. Just don't want to ask her and ruin the surprise... Help please! Thank you!