I claim the ornamental design for an artist palette, as shown and described.
FIG. 1 is a top view of an artist palette according to a first embodiment of the invention.
FIG. 2 is a top view of an artist palette according to a second embodiment of the invention.
FIG. 3 is a top view of an artist palette according to a third embodiment of the invention.
FIG. 4 is a top view of an artist palette according to a fourth embodiment of the invention.
FIG. 5 is a top view of an artist palette according to a fifth embodiment of the invention.
FIG. 6 is a top view of an artist palette according to a sixth embodiment of the invention; and,
FIG. 7 is a top view of an artist palette according to a seventh embodiment of the invention.
The claimed design is only directed the top surface of the artist palette as shown in the top views of FIGS. 1-7. The portions of the artist palette shown in broken lines are included for the purpose of illustrating environment and form no part of the claimed design.