The answer to this puzzle is what this puzzle is missing, besides well drawn pictures
MOHAWK - HAWK + DIVERSE - DIVE + COBRA - BRA + DELIVER - LIVER
= MORSE CODE
After applying this, you now get:
-.-. --- -.. . ... - .- --. from all the lines and dots in the images themselves,
which is CODES TAG. (Found by @Will; confirmed by OP)
(I originally followed the rebus pattern of subtracting right from left and got "TEST" out of it, but that wasn't the intended answer.)
The rebus is Morse Code.
Mohawk - hawk = mo
Diverse - dive = rse
Cobra - bra = co
Deliver - liver = de
The next part was tricky to figure out, but Will pointed it out in a comment.
Using the current International Morse code, and determining which lines and dots are part of the solution:
The dashes and dots in the eyes of the face with the mohawk, -.-. is C.
The three vertical lines in the hawk's head, --- is O.
The vertical line and the dots representing the eyes, -.. is D.
The large dot representing the pool, . is E. The three dots on the cobra, ... is S.
The large line in the middle of the bra, - is T.
The wheel (dot) and base (line) of the dolly, .- is A.
Finally, the dashes in the equal sign and the circle representing the liver, --. is G.
The gives us Codes Tag, since the puzzle is missing the tag for codes.