I don't think I agree with the increase of contrast everybody else is suggesting (it seems to be the standard comment for any B&W conversion on this forum). The original version suggest subdued light (maybe from early morning or late afternoon) whereas with more contrast it suggets very strong and harsh side lighting. Sure, more contrast will give more impact but I don't know which one represents the scene more accurately in this case (only the OP can tell). I personnally prefer the more subtle original picture.