I made an adjustment on the prices for all my commissions when it comes to detailed backgrounds (which is completely optional).
Before I had a flat additional price for them, but now I changed them so the cost of detailed backgrounds would correlate to the overall price of the commission by 50%. For example, a commission that would be priced originally at $90 USD would cost $135 USD with the detailed background!
And to those that are currently awaiting commissions don't worry, your prices are not being affected!