I guess photos of an injury don't prove the cause of the injuries, but coupled with the audio file, there is now a significant reason to believe her claims.
Greenwood could now rely on a defence that the injuries were self inflicted and the audio recording was of role play.
If however witnesses can attest to aggressive and domineering behaviour from MG, he's on thin ice.
Likewise, if witnesses were to attest that the victim actually has a track record of deviousness and manipulation, then that could form MG's defence.