20 [M] Too skinny?

Recently I lost a lot of weight. I went home and heard a lot of "Are you eating?"s. My mom asked me to gain ten pounds for Christmas. I know I'm skinny, but I was happy with my weight. So do I need to put on a few? http://imgur.com/a/Ez8we I'm flexing so you can see how tiny my arms are. I know they are too small. :/

Side note, I'm getting a haircut soon. I know r/malehairadvice, but I figured since I was already here... Any thoughts?

EDIT: http://imgur.com/a/tI4KJ This new album addressed a few posts. I shaved off the douche-patch as instructed and posted before and after. I'm not trying to lose or gain weight. I eat when I'm hungry. The weight loss came from changing the types of foods I ate. I don't eat out as much and I normally stick to several small meals a day. And lots of weed. That's a picture of my VaporGenie, a Christmas present to myself. Aaaaaaand skinny jeans.