One the first image, it's not a case of being drawn wide but rather the shading(or rather in this case, lack of it) on several sections make them appear wide particularly the necks. It is important to note that the neck should appear thinner so that the nape will be visible and that the chin is slightly more prominent(for the male character). Though this may be avoided by covering with hair, it is also important that the hair should not appear hard, or in the case of the girl her hair doesn't flow with the contours of her body.
2nd image, the guy's hand and wrist seem disproportional. it's a bit too small compared to the girl's which appears to be of the same size. the noses seem fine here. but there should be shading along the top part of her face that is obscured by the guy. Necks again are too thick.
3rd image, guy's arm is unnatural. I suggest using a ball-jointed doll (easier to work with than actual people), a cheap wooden one will do, its a plus if it has clothes so you'll have an idea with the creases and wrinkles. the blushes I believe should run parallel and below the eyes. but there are times its the entire face. her face seems misaligned with the position of the neck.
4th image, the guy's nose disappeared or rather the anime physics is not as it should be. what is that? a towel or a french bread? articulation of the girls wrist and fingers needs work.
on hindsight, you really do have a tendency to draw things thick. Not sure about the eyes, don't know much about that.