The ornamental design for a photography accessory for mobilephone, as shown and described.
FIG. 1 is a front elevation view of a photography accessory for mobile phone.
FIG. 2 is a front and right-side perspective view thereof.
FIG. 3 is a right-side elevation view thereof.
FIG. 4 is a rear elevation view thereof.
FIG. 5 is a rear and left side perspective view thereof.
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines depict portions of the photography accessory for mobile phone in which the design is embodied that form no part of the claimed design.