To create the moodboard/aesthetic you're gonna need some apps.
I use picsart and Pinterest.
Picsart for the collage layouts and Pinterest for the Pictures.
Your collage layout can consist of a six square, eight square or nine square. Back in 2016, the 8 square was quite popular, now in 2017, the 6 to 9 square is a LOT more popular. ESPECIALLY THE NINE SQUARE
I'll show you what I'm talking about with my premades
Here's my nine square:
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My eight square
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And my six square ( I actually made this for LiamMyersx because he needed an aesthetic )
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Anyways that's all stay updated for FINDING THE RIGHT PICTURES AND WHY A THEME IS VERY IMPORTANT