I could be wrong, but I think its a girl. The skin around the throat looks too "tight" to be a male - males have baggy throats. In addition, females can vocalize to some extent - they don't have mating calls and will not sit there tooting away - but they can squeak and growl. If it is not calling (Thomas the Tank Engine) at this point/size, I'd personally be surprised if it was male...

What is the SV length?