Tools:

Soft, Hard, and Highlight Brushes.

Winter Brush set: https://assets.clip-studio.com/en-us/detail?id=1808110

Fill out your flats

First fill out the flat figures of your drawing.

Draw the background snow with a snow brush.

Use the same brush with transparent color to slightly erase a path. Add a ground color below and blur some areas to your liking.

Fully color in a layer on top and switch layer type to soft lighting to give it a night blue tinge.

Red Lighting

Create a folder above, fill it, change layer type to through and clip to folder below to affect the foreground objects. Lower opacity of blue layer.

I took the red area of my lanterns to the through layer and changed the type to Add (Glow). This is to have a foreground layer to color with the Soft Brush with blending mode in Add (Glow).

Add another layer above the line art and change it to Add (Glow) to color the gold of the lanterns.

With your soft brush add some light to the main figures in the blue layer, be careful to use soft strokes.

Shadows

Duplicate your blue layer, clear it and lower the opacity to draw the shadows in the main figures.

Use the hard airbrush and the dame dark blue for the lighter colors and a darker color for the dark colors. Use selection tools when needed.

Add a screen layer to add a red tint to the eyes.

Lower or increase opacity as you see fit.

Add another blue layer above the background and reduce opacity to give it a darker shade.

Highlights

Add red highlights with the highlight airbrush throughout the snow.

Finally use the higlight airbrush with an orange color on your blue layers to give it more brightness.

Now apply these highlights to the center of your lanterns.

Select the gold to add shine.

Finally add some highlights to the eyes.

All done!