Two step by steps (Patreon)

Notice that I didn't sketch the canopy, just the trees. Bad idea! I will learn for next time :)

The leaf brush is this: https://assets.clip-studio.com/ja-jp/detail?id=1726655

I ended up painting many of the leaves by hand anyway, which I think is a big part of why this ended up not looking like the Bloom into You backgrounds. When painting, I enjoy splodging colours down messily, but the Bloom into You backgrounds are very precise and very clearly use brushes for the leaves.

Decided the colours were boring so I added more?
(In hindsight, it was definitely my composition that was boring, and I definitely need to work on finding ways to make pictures interesting without relying on colour all the time.)

Sketch (and lines) done with https://assets.clip-studio.com/ja-jp/detail?id=1689019&uuid=20c82b4ebb-d74d-1b8d-23d7-36778d4258

My internet decided to cut out while I was lining this, so I couldn't google background refs. I figured I've drawn enough buildings recently, it would be okay to just wing it, there's going to be snow everywhere anyway XD

Rough colours! These colours were blobbed down with the intention of trying Clip Studio Paint's brand new AI colouring feature.

AI colouring works its magic!

Downside is that most of the contrast vanished, and the foreground and background are all on one layer.

Upside is that this took 5 seconds!!! Computers are amazing!!!

Darkened the colours using a brightness/contrast layer then got to adding shading on top.

More details

Coloured the lines, and more details. I'm pretty happy with this (though how and when did his gloves go from purple to red, whoops? didn't mean for it to be that Christmassy XD)

I'm looking forward to incorporating CSP's AI colouring into my workflow!