I agree, any reptile who has been undergoing improper care for awhile should get a vet inspection. This way any 'hidden' issues can be addressed, such as parasites, low blood calcium (ie MBD) infections (respiratory or otherwise) etc.
The patch on the throat isn't too clear...retained shed is likely, but it also looks like all the scales are missing...If your camera has a built in or attachable macro lens, take another picture with that active, it allows for much better and more in focused close up shots. Otherwise, most point and shoot type cameras won't focus on any object closer than 3 feet (each camera also varies on their minimum focal point, check the camera manual). Macro lenses allow for a much closer focal point...mine has one that is within an inch or two...very nice for close ups of reptiles. You may need additional light however.
Another useful trick is place your dragon in a glass or clear buttom container...take the pciture of the underside of the dragon through the bottom of the container, but aim at an angle...so avoid flash reflections 'whiting' out the dragon.Or use a diffuser to remove the harshness of the flash (simple diffuser, tape or otherwise stick a single layer of tissue paper over the flash (Kleenix in a pinch) Take a few practice shots, maybe with a book in the clear bottom container...to minimize stress on your dragon.
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PHLdyPayne