Only thing i would suggest is try and get some pics in the sun? (If we get any more)! Can't really see her personality in the pics and the picture of the flat work is a bit dark and too far away. Oh and maybe do the confirmation pic without someone on her?
Hope that helps, pictures are always the first thing i look at on adverts!
I'd like to see her without the martingale, I don't know why I just like to see a young horse without anything but a snaffle & cavesson! I can't really tell properly but the martingale looks quite short? Could be wrong tho...
I agree with the above - I don't like seeing any artificial aid at all in a photo - martingales and whips definatly not.
Perhaps you could add a photo of her stood squarely in just a halter? I like to see the horses' back and stance in a photo too and perhaps one of the horse informal in a field.