1. Initial Sketch
2. Adding Details
Here I added details to the sketch to add a bit more life to the room. You can also see my grid overlay here to give an idea of how it'll look in the game.
3. Lineart
At this stage I refine the lineart by drawing over it on a new layer to make the lineart, which will be the basis for how I color the map.
4. Flat Colors
This step is pretty self-explanatory- now that I have the lineart done I just filled it in with colors. I try to keep everything separated so as to make moving and changing things easier, as you'll see later I had to edit some parts and changed the colors of others.
5. Shading
And here's where it's all coming together! I shade each of the parts and do a bit more tweaking, such as changing some colors and adding the pictures.
6. Programming
Finally we reach the last stage- putting it in Ren'Py! Putting the map itself into Ren'Py with wall collisions isn't actually too hard with my current setup, so now Kotachi is able to walk freely around his room. ...Just don't ask him to interact with anything yet.