Have you read the requirements of how pictures should look like in the Guidelines here: https://mydramalist.com/discussions/support/17285-guidelines-editing-and-submitting-new-dramas-movies-and-actors?pid=2006033&page=1#p2006033
"Criteria for good pictures (Example: Top 20 actors):
1) Pictures should focus on the face, not the body of the person or an item they are holding/wearing.
2) Pictures should be of high quality.
3) The picture should be a close-up to the face, but not so close that the face of the person is cut in the cast list pictures. Basically, the image should show the full head of the actor (all hair and face if possible) and include equal spaces on top and bottom of the page with the person's head in the middle.
4) The person's face should be straight toward the camera so their full face is shown.
5) No watermarks are present in the picture."
Basically, it should be a good quality passport-like photo showing only the face, hair and a bit of neck with enough blank space around the head so the face doesn't appear to get cut in the search box. Your picture posted above doesn't appear to fit the criteria. You may need to re-size or crop your pictures so that it meets the required 300x360 px crop ratio too.