"react-native-image-crop-picker": "^0.16.1",
"react-native": "0.46.4",

Any news about it? I'm dealing with same issue.
@brkrtp, @thebergamo you can try this fork
here we have solved the issue of image quality. For android we've used another implementation than in original package, that provides more control on how to crop the image. Hope you'll enjoy.
@KamranKhankhail will try it :D thanks.
It also improve the quality for iOS ?
i have modified the original package to upgrade the internal crop library so try this fork
i have an issue with cropping the image so I take a fork from @KamranKhankhail but there is no option to select cropped image so just resolved this issue
compressImageQuality:1,
outMimeType:"image/png"
set above 2 properties to improve the quality.