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You can almost always get printer profiles from the printer. Many even have different profiles for each paper type they print on, at least they should. This can alter your black point by quite a lot and leave things looking flat or way too saturated. If you can, ask for the profiles, load them, and see what it will look like using the proof setup option in Photoshop. If you check the "Simulate black ink" box, you will probably find that a little more contrast will help the photo out.
Make sure you convert to CMYK in Photoshop (if conversion is necessary) using
Edit > Convert to profile > then choose the appropriate profile from the drop down. This will create a better conversion than simply changing the color mode.
Also, cropping or correctly re-sampling the photo in Photoshop, then placing it in InDesign is the prefered method of sizing photos by most printers. Altering the size in InDesign can create larger than necessary file sizes and lead to slower print times.
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