Mark Todd's art exhibit "Oh, Man" closes this coming week. The bright, colorful work prompted Houston Press contributor Dusti Rhodes to note, "It's no wonder Mark Todd calls his exhibition 'Oh, Man.' Because that's exactly the kind of stunned/amazed response his paintings and illustrations coax from viewers."Todd's work resembles vintage comic book covers, with a few added embellishments such as rockets, lightning bolts, and flames. 11 a.m. to 8 p.m. Saturday, and 11 a.m. to 7 p.m. Sunday,