The relationship between Batman and the Joker is something curious, they hate each other, they respect each other and they need each other.
They are two sides of the same coin?
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You can see the step by step here
I believe they may have some sort of "porportional relationship"... Like when in a ocntrolled system something goes up, another thing goes down... It's an interesting relationship between parts but they fit really well in this universe... Nice drawing! you could have detailed it a bit more... Peace...
Yes, you are right, that point of view is also interesting. thanks, I will be more detailed, I will upload soon something better