Not just you, I think that is the dominant thought on his looks.
I agree as well and I think that’s a deliberate artistic choice that was made, although I’m not 100% sure why they did it. Maybe they were like ‘this is really funny’.
I mean Light looking alike to Ryuga just shows again how attractive Light is meant to be in universe, while L shares a lot of Ryuga’s features and is the exact opposite of conventionally attractive. I guess that’s just like.. study in contrasts again.