Ah yes, I suppose that would answer how he was able to take said pictures. But:

1. He would need to take said hand mirror for that, which would take far more ectosteempowerplasm
2. He would need to position said hand mirror for the pictures, after all, most of the art of a good picture (on a smartphone at least) is in positioning the mirror correctly. This would take more ectosteempowerplasm.
3. For the second picture he would need to move said hand mirror inland a considerable amount. For that much contact with the outside world he'd practically need enough ectosteempowerplasm to be a whale!
4. How did he even move inland that much? It seems implied that he cannot leave the shore he died upon.
5. You still haven't answered my previous point that he appears to have no idea how to maneuver modern contraptions.

Though I thank you for trying. You put in a good effort, but it seems you are no match for my wit and my guile. Ok, I should probably stop bragging now.
I've overused this picture, but it just fits so well.