Mobile internet is not good on 4g either(not sure if it is the hardware or the software of this phone which sucks). Generally download works fine on Whatsapp but the problem is on the browser/chrome. The worst part of this mobile is auto sync feature on mobile internet. The same feature works perfectly fine on Wi-fi. But on mobile internet my mails are not getting downloaded automatically.
The images I would say are good(given the price range of this mobile). No issues with battery backup(I keep my 4g on and it still lasts for 14-15 hours). Sound quality is average. Though I have not heard high bass songs yet. They might not be so smooth as soft tunes sound very soft on this phone(that is the treble is high).