I think all the ties are quite good if not excellent and I would keep the wing and hackle as it is, but they should be changed because based on the picture of the actual fly - they are not ribbed either brown or yellow - they are striped. I think the underside is all yellow (light olive). If the fly is to be ribbed, I think it should be yellow ribbed with brown. BUT -
I think it would be more accurate to tie in 3 dark brown hairs for the tail leaving the butts not tied down. Then trap the three hairs with every other wrap of the LightOL dubbing to make the alternate striped effect on the dorsal side.
I would comply with a picture but I just got back from 4 days of bass fishing in central Ontario, so can't get out the tying kit just now.