It's ok to fail. The bad failures are the ones caused by caution, by not pressing hard enough.
If you're nervous about looking at Man Ray's pictures, and your landscapes all feel derivative and weak, that's bad. If you fell in love with Man Ray, and now your landscapes are all abstract, insane collages that make not a lick of sense, that's good.
If you couldn't take the right pictures because you were using a camera that was too exciting, too new, too crazy, that's OK. If you couldn't take the pictures because you couldn't bear to use anything but your old warhorse equipment, that's bad.
Push it. Fail. (If you're shooting for money, have a plan B)