It's hard with weight since length, age, and weight distribution all matter together. I've watched a lot of videos online and looked up pics to get a better idea. Going to list things to watch for body health from what I've read/seen.
Fat pads on top of head behind the eyes/above the ears can be slightly squishy not sticking out not sunken in, jowls present but more deflated than full, the stomach viewed from above should not go out past the knees, stomach from the side should not touch the ground at all when dragon is standing or walking, dragon forearms should not be larger than the upper arms/about same width is okay, and base of tail should feel a little squishy/not huge or bulging with a load of excess fat.
Any one thing being off may not be an issue, since dragons can vary in shape a little. Except for the head fat pads. Those being huge or sunken in are a sign something is wrong. Could be diet related or a sign of illness. I'm sure I'm missing some details, this was a quick "jist" of the more important body shape and weight distribution that come up in different resources over and over again