Available Originals
Poor Quality
Even though this is a cute picture for a photo, I would not be able to paint from this image. I can't see any of the eye area and very little fur detail on the right side. This also would have been better if it were taken on eye level with the dog.
If not for the shaded eye area, the white beard and left side of the dog would be acceptable although not ideal.
Good Quality Photo
This is the same dog but in much better lighting. I can see every detail I need to see including clear eyes and eye rims, nose detail is great, I can see every hair easily on this dog. She also has a more pleasing expression and the photo is taken from eye level with her.
As you can see here, if I had tried to paint her from the above poor quality photo, I would not have known she has brown eyes or the stripe of white hairs going up her forehead.