Rose, I see no problem artistically with representing disabled people, no more than I see in representing the human body in all it's forms. I do a lot of nudes, artistically I have no problem with that.
Then we come to the second part, people. I mark all my nudes as NSFW and remove the t-shirt/ garment option. I have a small selection here, and they are among my most seen but least liked or commented.
I have also done a series of amputees, albinos, dwarfs, morbidly obese, contortionists, polio victims,tattooed and pierced bodies, in short, the ones not featured in fashion magazines. These are not available for several reasons.
Back to people, people are curious, or worse, and you may find they take your images out of context, some of my work has been fetishized, it could happen to yours. To be blunt, some people get off on pregnant women , or black men, or, yes, disabled folks.
It all comes down to context, and how much you can control the use of your images.
Listening to the people I have drawn, I have made some available for charity purposes for very limited contexts with their permission, but many feel the images are not for public consumption. I tend to agree with them.
That said, if I were painting a crowd, a school, I could see some disabled being a part of it, but not as isolated individual pieces