Unable to render high definition image

I am new to Blender and I am learning to render images in cycles.
Someone told me that higher sample amount will increase the quality of the render, but still, after 1600 samples, my rendered images are not in good quality.
Please help me to understand how I can render images in good quality. I rendered this wall but when I zoom in it becomes blury

• The quality of the reflection will never be better than the quality of the HDRI. Try using a better quality reflection map in the world properties. May 10 at 14:59
• And set the roughness value of the sphere (closer) to 0 (it's unclear from your image whether the environment map or the material of the sphere is to blame). May 10 at 16:13
• (I also suggested an edit to your post, and am assuming you are wondering about the quality of reflections specifically. If that's not the case, please revert the post back to its original state :) May 10 at 16:28
• Well, if the image in your question is a render, of course it will become blurry when you zoom in. Can you please tell us in detail what you're doing and what your goal is? What do you want as a result, and how are your current results inadequate? May 11 at 10:11
• Try rendering at a higher resolution and see if that's better (quick tip: you can do basic math in the numerical value inputs in Blender: say the current resolution is 1280, click to edit, add *2, and it will multiply the value by 2). Since the render process likely starts from the center outwards, you don't have to finalize the render to get a good impression of the final quality. May 11 at 13:46