Resolve links and decide whether bleed belongs in the preview
An INDD page may refer to external images and typefaces. Check preflight and make sure links are current before exporting; a missing or low-resolution asset can dominate the JPG even if the rest of the layout looks correct.
Choose whether the image should show the trim area or include bleed. A casual proof and a printer's production file have different purposes, and JPG is generally not a substitute for a print specification.