Here's how I make MSPFA sprite backgrounds.
This is the grid I made and use specifically for making rooms.
This is the grid I made and use specifically for making rooms.
Then following the sketch, I very loosely line over it. I don't strive for perfection, which while being in perspective to the grid still gives it an element of imperfection. Thus a "hand-drawn" look
Use line thickness variation as you're making lines, erase chunks out of them.
Use line thickness variation as you're making lines, erase chunks out of them.
https://cdn.discordapp.com/attachments/420836494308147201/734139252215906365/4k_Isometric_grid_for_Homestuck2.png Here is a high-quality grid.