Vsco has a great grain tool, and I do love a grainy image as it gives a film-like quality.

Task: Try adding different grain strengths to some of your images.

Tip: You will see a haze on the bottom left of this image, it looks as though a light-filter has been added. It has not. I used photo mode which allowed me to get get very close to the leaf in-front, which is covering a small part of the lens. Give it a try yourself when next photographing some blooms.