I had earlier removed the two images that refuse two show but they are back on my post now.
I see what the problem is now. You are trying to link images that are hosted locally on your PC.
http://file:///storage/emulated/0/Download/tokyo-3131978_1920.jpg is not a website or something bitcointalk can fetch data from.
You'll need to upload your image to something like Imgur, and then use that link instead of http://file:///
You did use the tags correctly, so no issue there.
Thanks. It finally worked when I used imgur as you suggested.
Just one question: is their a required pixel size for images posted on threads?
I don't think so, i am able to post 1x1 pixel images just fine. See above^^
There might be a maximum size though, as i don't think 5000x5000 resolution images would be a very good idea. (Due to the internet speed of some users and the already slow loading images..)