My skin has such eyes, which are similar to the 2x1 eyes, but are one pixel closer to the corners of the front texture:

Two pixels that are on sides of head texture could be ignored I guess, as for the eyes on the front texture new type should probably be made. Hopefully I didn't make any sufficient mistakes in this template:

This may be a duplicate of #43, #40 and #13, and even though my skin isn't a mob skin, this eye type is somewhat common, most known example being Fundy's skin.