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Hi, quick question. I'm writing a sheet for a piano piece, and there's a brief modulation in the second and fourth systems/lines here:

Do you think it'd be easier for the player if I explicitly write the key signature change, or should I just leave it in Eb minor like this:

For clarity, for the rest of the piece beyond the image I showed, it just stays in Eb minor

@SirCumference I prefer changing the key signature since I notice the notes form the F7 chord and the Bb7, which is much easier to detect, and thus to plan my fingers accordingly when the key signature is 2 flats.

@GratefulDisciple Got it, thanks

One other question, is it generally good to include double barlines for key signatures like that, or only when I'm beginning a separate section?

@SirCumference Double barlines seems to be the convention, you're doing good in both instances (when changing and when returning). When changing to lesser flats / sharps, sometimes the engraver would put natural signs such as in the Chopin Waltz below. But personally, I prefer without (less things to read).