Does this mechanism seem correct?
I think it's fine. In the step where H
2O is lost, it is more conventional to draw a curly arrow from the -OH lone pair kicking out water to give the protonated ketone directly (i.e. go directly from the second structure to the fourth in your answer). Since your third and fourth structures are resonance structures, your answer looks perfectly reasonable to me.
This mechanism is analogous to acetal hydrolysis - this mechanism is easily found via google or textbook.