I disagree with the above comments. Even if you replace your Adsense ads as suggested you'll still be making at most a couple of cents per hundred visitors or something equally stupid.
Your site is aimed at selling the posters yes? And making commission on each sale. So you need to focus hard on that.
Adsense is a distraction. The inclusion of Adsense makes your site say to your visitors: "Hi, I'm selling this that or the other, but I'm not really sure if you'll like it and so if not click me as a second option."
So, first of all forget Adsense for the time being - if you want revenue from Adsense then make a site specifically for Adsense (And that is a whole different world of SPAM).
So, first problem I see no posters above the fold. That is, when I visit your site I see no posters without the need to scrolling first.
Secondly you have no introduction, no call to action and the layout is weird.
"Dorm Room Decor - Dog and Puppy Posters: Woof Woof!" What does this say to you? Ok, it says the basics; A name (of sorts), a description, and what seems like a sarcastic; "Woof Woof".
1) Work on the name: Dorm Room Decor is as boring at it gets. I'm turned off by the time I've read this, and looking for a way out (not Adsense!). Add at least one exciting or unusual word, I'm no expert, but: "Sublime Surroundings", "Dynamite Dorm Decor", "Classy Canines", "Delightful Dogs", "Prestigious Pet Posters" anything is better than "Dorm Room Decor".
2) "Dog and Puppy Posters: Woof Woof!" Sorry - all wrong. Use this "strap line" to say something special, say something unique, and most importantly of all - tell the customer what to do!!! It's easy - and use the word "
Buy"!!! "Buy beautiful, high quality posters of dogs and puppies at great prices, browse our comprehensive catalogue and make your room feel like home today. Just one click takes you direct to our supplier!". (Your an affiliate site yes? People will often shy away from this, they mistrust being passed from one site to another when they may not expect to. So turn this into an advantage.)
3) Lose the other text: "Doggie pics are the #1 way to stay cheerful on your own." Huh? No there not. No one believes this, and it certainly won't help you sell posters. This also: "And dog posters are the cheapest way to lighten up your dorm room" No, sorry! No one is falling for that - for a start Cat posters are just as cheap!
4) Ok, so you also have the posters in a thin line down the middle of the site, two thirds of the way down the site you are only using 1/4 of the site width. Its a waste of space and annoying to scroll all the way. Rearrange the posters so that it appears as though you have trouble fitting them all in, but just made it neatly. 22 posters - I suggest rows of four, (keep the quotes they are a nice touch) Make two rows of four, then a quote across the entire row as a divider, then two more rows of four and another quote, finally the last 6 posters as a row of 4 and a row of 2, centralize the bottom two.
5) If you want to keep the Adsense, place a banner across the bottom, if someone scrolls down this far and doesn't like anything - you give them a monetized exit.
6) Finally - organize the links on the left better, they look messy because they take up more than one line. For example shorten: "An Invaluable Lesson in Healing" to "Lessons in Healing" and "Andy Warhol's Cats and Dogs" to "Andy Warhol's Art". Get each item on one line, not only will it look better but you'll also get more information in the same amount of space.
Well - you did ask. Hope that you find some of my suggestions constructive.
Good luck with your site...
