That looks to be a tw225 JDM tail cowl....but the model looks like a Euro market TW125 from around 2002-2003. Maybe a euro member would know if that cowl was available in Europe also... It looks different from JDM 225's in that it has some kind of (lower) fender and subframe eliminator, and a tinier tail light. Plus, I think the tank color is Euro only(on edit, maybe not, could just be lighting). Also note, your bike in that pic has a cut down seat, so there have obviously been some aftermarket modifications.
Here is a 2002 JDM TW225 from that era, note the JDM tail light: