did you try going to your app menu then to the "downloads" app?
seems silly but sometimes people dont realize thats there. see if the pic your downloaded is there, if it is click it and it should open in your photo viewer or ask what app you want to open it with.
or you can also go to your downloads folder using a file manager. I use Astro and am very fond of it.
doing it that way you would go to astro, locations tab, local storage1 then find the Downloaded folder.
let me know if this helps you at all.