There was another thread (which I can't find at the moment) which sort of goes along with this and had me like Grima's appearance as shown in the movies.
One, he looks just like your typical squirmy/wimp bad guy; small, black robes, black hair, and pale skinned, (he had yellow teeth too right)? So he just represents the typical bad guy.
The other is I think it goes in to explain why Grima began to dislike Eomer, his people of Rohan, and ended up turning to Saruman. He is out of place in Rohan. The typical description of Rohan has been said, Eomer, Theodred, Theoden, and the other great marshals/people look like this. Grima is left out. Also, these are soldiers, Grima is a councillor. So making him different from the rest of the Rohan people one makes him look like a bad guy, two explains why he would dislike people like Theoden and Eomer.
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