I was thinking about Voyager episode "Prophecy" and the way T'Greth noticed that B'elanna Torres was part Klingon just by looking at her ridges. I figure the ancestors of those Klingons came from sometime between where Star Trek Discovery takes place and where Star Trek 2 takes place. The Klingon appearance has changed multiple times in their history by the time their ancestors began their journey to the Delta Quadrent. A half Klingon on TNG looks most similar to the pure Klingons of Star Trek 3 to Star Trek 6 and yet T'Greth knew she was not fully Klingon anyway. Any guesses on what kind of Klingon a half human/half Klingon would look like on Star Trek Discovery? Also how did those Klingons on VOY "Prophecy" know what a part Klingon looked like? ^Albino Klingon from Star Trek Discovery
I would imagine that it would look much like the DSC Klingons, but perhaps a little "softer". I have a feeling that the writers of Discovery would tell you that klingons and humans cannot reproduce.
In my mind, there are only two ways a Klingon looks like: ridged and non-ridged. Everything else is to be ignored per Roddenberry's edict ("they've always looked that way", i.e. a visual retcon). Klingons have hair, per DS9, but it's possible that the Discovery Klingons do not have hair due to genetic tampering and an attempt at a cure from the Augment virus (implemented to meld with Worf's comment in Trials and Tribble-ations). The Klingons in "Prophecy" are "pure Klingons", not the viral augments seen in Enterprise and TOS. The Klingons in Discovery might also be pure, or perhaps a transitional phase trying to get back to what a Klingon should look like. The Prophecy Klingons know what a partial Klingon looks like, because they dealt with them on a daily basis before leaving the quadrant. They may not have known she was a hybrid, but they could tell by her subtle ridges that her blood was "not pure" (i.e. she or her ancestors could have been infected by the augment virus).