照 (zhào) = to take (a photo)/photo
片 (piàn) = thin piece/flake/slice
照片 (zhào piàn) = photograph/picture
We saw zhào before in:
照相机 (zhào xiàng jī) = camera
拍照 (pāi zhào) = to take a picture
So 张 is the measure word for table, but also for photos?
It's a measure word for flat-surfaced things.
Measure for table?
Because it has paperlike(thin and plane) property
if you say “这儿” rather than "这里“，is "照片儿“ acceptable as well?
Yes it is
Does the tone for 片(pian) sound off to anyone else? It should be 4th tone but sounds like 1st tone to me.