Patreon 10$ sketch should be raised to 15$ ? (Patreon)

Well guys, now i have finished your sketches, what do you think about raising the price of this sketch to 15$ ? And if i do, whould you raise your pledge too... ?

I'm working around 1h30-2h on every sketchs 'cause i dont wanna rush it and finishing it in 1hour or less, and i feel it's maybe a low price for a "commission" and maybe a too "good" reward for a pledge. Honnestly i don't know, i need your view about this guys please :)