Potting medium looks quite damp. Most house plants need a lot less water once cooler and duller wintertime conditions start to occur.

If you provide that plant with a very well draining mix and good indirect light, it should make a good come back as soon as possible.

How long do you have to wait before that mix dries out?

Also, if you can, use fresh water, bottled or rain water if you are using a mix that fine textured like that.

Mike