In our studio we got the assignment to work on a 'Master Assignment' each half year. Goal is to train your skills, and bring them to the next level. In other words, this assignment should expose your 'weaknesses' so you know what skills to work/study on.
1st step: write a story.
2nd step: make sure every aspect of your drawing supports your story.
Two boys are best friends. After school they play sneakily in the neighbours garden, which is just further down the street where they live.
Here's my process on my 1st MA ...