Chris Brown -- New Accuser Says I Have Picture Proof He Assaulted Me

The woman who claims Chris Brown and his entourage forcibly threw her from a tour bus says she has proof she was manhandled .... graphic photos.

We're told the woman is telling friends Chris was the culprit who yanked her off the bus, causing what she says is significant bruising.

As we previously reported -- Chris was at a Colorado strip club filming a music video -- when the woman refused to give up her cell phone on his tour bus and was removed.

She's claiming assault ... and cops say Chris and his posse are persons of interest.

Cops tell us they have security footage showing the woman leaving the bus but they haven't seen her photos.

We're told the investigation should wrap up next week.

Chris is calling BS and says it's simple ... he's an easy target and she's looking for a payday.