Promo flyer

Hola! Hey dude, you got some nice effects here like the poloroids and the tickets, but I am not digging the background or the 'El Grito' text. Also, is that supposed to be blood splashed around? It would scare me to go there. I would choose a different background, change the grito text (maybe make it big on the top right hand side and bring down that poloroid). The mic isn't needed either, in my opinion.

“Imagination is more important than knowledge. For knowledge is limited to all we now know and understand, while imagination embraces the entire world, and all there ever will be to know and understand.” - Albert Einstein

This is way too busy, I think you need a focal point. The text is too symetrical to be visually interesting. I guess this is supposed to be hard core music and hence the blood splatters on the wallpaper, but isn't that a bit cliche?

The info that's most important, the show dates (I'm in a band so I know, je je), is too small. I agree with the hierarchy comments above: Pick one central element and build around that.

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Powerpoint is not a design application