Images are tightly cropped, leaving no space in the four corners.

Hey @Vinoth Kumar V 

Just to add a bit more to what @droopydog500  mentioned about the ratio.
Keep your reference image smaller than the desired out come. FF tends to extend "wings" and other related things.

Other tips:

Keep the logo smaller than the tshirt/ shirt.

When you use a Ref Image, attempt to place the image in accordance to where you want the outcome to be. 
Example

these images are to demonstrate how location is important when placing the images.
Cheers

O.Nate

Hello @Vinoth Kumar V,

Thank you for your message. I am sorry you are having this problem. 

Are you using a composition reference? If so, please make sure the composition reference is the same apect ratio as your generated image.

If you are not using a composition reference, consider using one and position the dog in the reference image where you want it in the generated image.

You can also use generative expand to expand the image and give it more space.

My best,
    droopy