The problem with the girl on a nebulizer is that the image is such poor-quality (terrible lighting, poor resolution) that whatever subtle distinguishing elements that would render this as illustrative of CF (to the exclusion of all other respiratory conditions) are completely lost - it looks like a girl with a breathing mask, and while it could be for CF, it could just as easily be for chronic asthma, bronchitis, allergies, or maybe she just doesn't like the shampoo her mom used on the rug (:-)). Simply put, this image doesn't illustrate this condition - we cannot see sticky mucus, or anything that would allow even a trained medical professional to make the diagnosis of CF just from looking at it. It's a touching image, and I understand why some may be attached to it - but as an encyclopedia, we need to base our decisions on more logical, objective standards. The end result of using the nebulizer picture in the lede is to make the article look amateurish - a picture of someone missing an arm is good for an article about amputation, but a picture of someone in a knee brace isn't really such an iconic example of a ACL tear that it'd be fit for the lede there. It's like using a (blurry, poorly-lit) picture of someone with a mansion and a yacht they bought with lottery winnings in the Lottery article, rather than an image of a lottery ticket.