Hiro Mashima certainly knows his way around a pencil. The Erza pic reminds me of Yabuki (To Love Ru) art, think it's the hair.
As far as weekly manga go Fairy Tail is very easy on the eye. Compared to the likes of Bleach which has no backgrounds and Naruto/HxH which have lazy creators. If Kishi tried as hard as Oda his manga could have looked amazing. When he's bothered he draws stuff like...