Well... hmm. (thinking).
Okay: put a candle on a table near a wall. Have one point light (not too bright) on the room, and take a photo of the candle on the table. See how it emits light?
Remember, a candle is not a pointlight (i.e. a directional light, akin to say, a down light or spotlight), it's light emission is circular and soft (excluding the wick and blue part of the flame).
If you take a look at the womans arm, it seems like you (the observer) are pointing a soft white light at her. Because of this, the candle's role in the painting is reduced (unless this is deliberate). This light source is confirmed again with the dull sheen on the mug (which appears to be receiving white light), and then with the shadow cast on the wall by the candle.
Highlights in this work should be yellowish because of the flame, including skin highlights.
I hope I'm making sense...