mixed media collage-working with sharp edges

someitme we want to work with full pages of images...how do we get rid of the sharp edges?
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amazon links;

brush- https://amzn.to/2M4rdxX

modpodge- https://amzn.to/2JR2fFu

stabilo 12 pack- https://amzn.to/2MCN8xw

shimmer sprays- https://amzn.to/2t5dIXA

black gesso- https://amzn.to/2MD0B8v

circle stencil- https://amzn.to/2MzvgmW

Видео mixed media collage-working with sharp edges канала LorriMarie Jenkins