Use the same url that I showed you in the previous conversation.
https://www.themoviedb.org/talk/5cc038239251410671fc8fde
When the URL has the term Original, it means receiving the image in the original size that it was uploaded.
The other possible sizes you can see here
https://developers.themoviedb.org/3/configuration/get-api-configuration
https://api.themoviedb.org/3/configuration?api_key=[THE_KEY]

Example
https://image.tmdb.org/t/p/w300/asmCFd6BnqPkwIj0jHzcJXgNJvi.jpg
https://image.tmdb.org/t/p/w780/asmCFd6BnqPkwIj0jHzcJXgNJvi.jpg
https://image.tmdb.org/t/p/w1280/asmCFd6BnqPkwIj0jHzcJXgNJvi.jpg
https://image.tmdb.org/t/p/original/asmCFd6BnqPkwIj0jHzcJXgNJvi.jpg

## Add Supported Image Sizes  
                                 Min Res      Max Res  
poster   = Poster ............  500 x 750   2000 x 3000  
backdrop = Fanart ............ 1280 x 720   3840 x 2160  
still    = TV Show Episode ... 1280 x 720   3840 x 2160  
profile  = Actors Actresses ..  300 x 450   2000 x 3000  
logo     = TMDb Logo  

## API Supported Image Sizes  

|  poster  | backdrop |  still   | profile  |   logo   |
| :------: | :------: | :------: | :------: | :------: |
| -------- | -------- | -------- |    w45   |    w45   |
|    w92   | -------- |    w92   | -------- |    w92   |
|   w154   | -------- | -------- | -------- |   w154   |
|   w185   | -------- |   w185   |   w185   |   w185   |
| -------- |   w300   |   w300   | -------- |   w300   |
|   w342   | -------- | -------- | -------- | -------- |
|   w500   | -------- | -------- | -------- |   w500   |
| -------- | -------- | -------- |   h632   | -------- |
|   w780   |   w780   | -------- | -------- | -------- |
| -------- |  w1280   | -------- | -------- | -------- |
| original | original | original | original | original |  

Original Size is the size of the uploaded image.  
It can be between Minimum Resolution and Maximum Resolution.