The following are the 31 subjects for each day of July.
Please note there are some rules to be followed which are at the end:  

1. Introduction
-. Friend(s)
-. Family
-. Spirit animal(s)
-. Food
-. Action
-. Colours
-. Facial expressions
-. Light and Shade
-. Vehicles
-. Room
-. The view out of the window
-. Weather
-. Design a character via a random generator* (rec)
-. A comic with the new character(⬆) designed*
-. Drawing Style of another artist: Please write the original artist and if possible, link to their gallery/sth
-. Draw in opposing art style: if you tend to draw grotesque & real, try sth fluffy & sd and vice versa
-. Characterise an inanimate object
-. Something you never drew before in your life
-. Favourite fictional character(s): Should NOT BE OCs. Don't forget to give credits to where it belongs!!
-. Favourite non-fictional character(s)
-. Favourite history
-. Favourite culture/myth
-. Music: Creeeeddiiiiteeeeessss~~
-. Film / Literature: oh cre cRE CREDITS
-. Couple
-. Special somebody
-. Hero
-. Fear
-. Dream
31. Conclusion

Rules:

- The order of the subjects done doesn't matter. You might choose to do "Family" one day and "Fear" the next. The only exceptions are the "Introduction" and "Conclusion" for..... obvious reasons.

- Because rather shockingly the aim of the challenge is to improve one's art skill, you SHOULD NOT  REPEAT CHARACTER/OBJECTS. What I mean by this is, you should really not draw a character or an object as the main subject of the artwork more than once. So if you drew a pair of rubber gloves for "Something you never drew before in your life", than you should not choose a pair of rubber gloves again for "Characterise an inanimate object ". (There is an exception which i have marked with *)
The reason for this is to introduce variety into the challenge and to really push one's comfort zones. But it is (sorta??) free world, so if you insist to draw same character over and over again..... what can i do? :/

- Though I have tried to make the subjects as typical(?) as possible, this list is still more tailored to fit my weakness. So please feel free to change themes e.g."Fear" or "Food" to fit the area you think needs improvements

- Lastly, pretty pLEASE ADD CREDITS TO WHERE APPROPRIATE.

So yeah... the subjects can be interoperated in anyway but if I was not clear enough on anything, please feel free to tell me via commenting below.

Then see you in July!! ;D