From your picture I see holes and yellow leaves. If that is what you’re referring to then there are a number of possible causes. You will probably be able to assess them better as you can judge from close inspection. First, the holes are most likely caused by insects. Japanese beetles were snacking on my rose in June and July but have been stopped and the bush seems to be recovering nicely. If you do see beetles pick them off, drop them in soapy water. That's more effective than the bags that are sold in stores or chemicals that will harm beneficial insects.  Aphids and spider mites often find rose bushes delectable and can cause plenty of damage.  For more information on insects and the solutions you might find the following website helpful: Rose Insects & Related Pests | Home & Garden Information Center (clemson.edu)

There are many causes of yellowing leaves so it’s important to work through the possibilities. The yellow leaves may be a reaction to the insect damage or may be a cultural problem. The most common cause of yellow leaves is lack of water. We’ve had a hot summer, and roses need plenty of water to cope with the added heat. However, roses can receive too much water which will also cause the leaves to turn yellow. Be sure to water only the soil around the rose bush as water left on the leaves may encourage the growth of fungi or damage the leaves as it’s drying.

Also, it is possible that your rose is not getting the necessary nutrients. A soil test will tell you what your rose needs. You can get a soil test kit from your local extension office 440 Vernon Odom Blvd, Akron, Ohio 44306. Phone:<personal data hidden>. You will get detailed information about what needs to be added to the soil to maintain the proper nutrients and soil pH.

A third cause could be lack of sunlight. From the picture your rose did seem to have plenty of light, but you would be better able to determine if your plant gets six or more hours of sunlight daily.

I did see a few leaves with brown spots which may indicate the beginnings of a fungus. Those leaves should be removed as soon as possible and thrown away. Don’t put them in a compost bin as the fungus will spread. For more information about rose diseases you may find the following article interesting: UT-Extension-Rose-diseases-Identification-and-management-W833.pdf (tennessee.edu)