My poster is smaller than other posters on IMDB

I've uploaded the poster for the following film: Sugarbaby

As you might see, on the page, it's smaller than other movie posters on IMDB. 

I made the image on CANVA using present dimensions. 

I uploaded it as a JPG. 

I want to get it to the same size as other posters on IMDB.

Please advise.

Thank you so much.