Umm, why are you using InDesign to work on your images? Kind of like using Photoshop to write a novel?
Joking aside, why not use Lightroom to work on your images? What kind of "work" are you doing to your images?
Regardless, it sounds like a resolution issue. Do you know about resolution and how to adjust it? If I said an image was needed that was 5 x 7 @300 dpi would you know what that meant? Not trying to be snarky here, it's a fundamental question on resolution