It depends on your goal. For generic purposes most people advise using 75%-80%, when the image is still really good quality, but the file size is reduced drastically compared to 100%.
यो तपाईको चाहानामा भर पर्छ । सामान्यतया सबैले 75%-80% मा प्रयोग गर्छन, जब तस्बिर राम्रो गुणस्तरको छ, तर 100% को तुलनामा फाईल साईज अस्वभाविक रुपले घट्छ