changes to old and introduction of new tier (Patreon)

The character request tier has been bumped up to $30, but this allows access to a new tier, the silver tier, which allows you to request characters from franchises to be drawn. This means non-original characters, and doesn't necessarily guarantee a polished image, but will result in at least one sketch that month of that particular character.

if you are pledging to an affected tier, please review and adjust accordingly.