The Schefflera seems to be in a pot that is far too small, so maybe by spring it could be repotted with some fresh compost.
Have those pots got drainage holes in the bottom?
The other common problem at this time of year is central heating, which dries the air and is really bad for plants.
I would be inclined to prune the Schefflera now before new growth appears as it will help to thicken up the growth - cut the tops off just above a node to a tidy shape.
The Pilea needs more light, which might be hard to find in winter, -( well, both plants do) You could try pruning that down too and make cuttings.... a little compost and a pot or two and you could grow baby Pilea plants in two or three months