My go-to brush for smoking/smudging eyeliner and shadows on or near my lower lashes is this pencil brush.
Tapered Blending E35
This brush does it all. If you need a brush that you can pack and blend shadows this is the one for you. I think this would be the brush I would pick if I was told I could only have one (next to the F80 of course). When I first started my collection, MACs brush that is comparable to this one was the first brush that I purchased. Its a definite must have!
I hope this post was helpful for those of you who were wondering what brushes you might need for a starter kit or the kit you have and was missing a little something!