I want to know how can i get a image which is saved in my gallery

Answer 1

If you are making an HTML code in a text editor and not a online compiler and saved it into a .html file then you can simply make a folder with that .html file and put your image there:
FILES/codes:
hello.html
ohhididntseeyouthere.png

<img src="ohhididntseeyouthere">

Answer 2

you need to script a file opener check on google or youtube.

Answer 3

Google online image uploader and choose one of the links, upload the image on their server and use the link they give you to use in your code. now you have your image everywhere