Every film has its grain.
Size, irregularity, contrast: each film stock is a setting of the physical model, to be calibrated against real negatives. Choose one to see its grain up close, then try it on your image.
Tri-X 400Strong, lively grain with reportage contrast.See the grain up close →
HP5 PlusRounder, softer grain with open tones.See the grain up close →
XPanFine grain for large panoramic prints.See the grain up close →