How to inporve the quality of my rendered image

i have used denoiser, resoluton 1080x1080 px, render300, but still image looks blury when i zommed it in.

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at first glance you need to improve “samples… they are too low” + “caustics” and “adding HDRI”…

Other than that the tea material looks accurate and the models themselves are nicely done too!

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i have use render 500 and viewport 32 approx how much i should use

…believe it or not, but anything that requires refraction (glassy stuff) I go 5000 samples minimum on a 4k render… This is debatable of course.

It all comes down to what you are rendering. Refractions require the highest sample count besides volumetrics (at least in cycles), in my humble opinion.