http://www.asianfanfics.com/story/view/2984/poster-request-shop-win-over-150-in-kpop-goodies-check-out-chapter-70-graphics-poster-request-myname-exo-posters-postershop <--- this one which I'm subscribing

Heyyyy unnie (: <3 haha,I know a few good graphic artist (:
1.Epic_Randomness
2.SophiaDiemmi
3.turnbaek
4.pinkspades
all of them helped me make my posters for my stories.Just post a message on their wall saying tht u want thm to make a poster for u (:

I suggested you this poster shop
http://www.asianfanfics.com/story/view/147588/s-w-e-e-t-b-e-a-t-z-c-a-f-e-g-r-a-p-h-i-c-s-r-e-v-i-e-w-s-h-o-p-apply-graphics-iusinger-request-reviews-graphicreview-lay
For the best cute and happy poster, 5hawol really done the great job XDD

herrrrooooo unni :3 I don't really know what style of poster your looking for, but you can always type "poster shop" into the little search box in the green superior right part in AFF :)