Hi, can any please suggest what is happening to my cuttings and what I should do?

Them seem to have stops producing stems and leave. Leaves are turning brown and dying off.

I've attached pictures, the soil is moist, I keep them in a vinyl bag that zips up, open it occasionally.

Please help, I'd hate to loss them after all this time.

Thanks

Possibilities are, too much water, low light. 

I agree looks like they need light not direct light just allow them to see some sunlight. What do you have them potted in could be a media problem also. No fertilizer not even mircale grow potting soil/mix.

I'm thinking it might be low light. What lighting can I use? Besides sunlight, not much sun these days.

Thanks

I have them in perlite and mixed soil. Should I allow the soil to dry out? Maybe in a warmer place.

Warmth (not direct sunlight) is good.

Do these cuttings have good root development? Or only vegetative growth?

Roots, look pretty good. How do I keep them warm by a window? Can I use artificial light?

Thanks