Pencil below the picture, then change detail file.

Not sure how to change the preview but if someone could remove or replace it that'd be great.

Yeah, the preview is unecessary in the first place. The ship itself is well done, though.

For an image like this, you don't even need more than just the small image, since the whole thing fits as the small image, but it large enough to click comfortably.

Do you think you may have got your images the wrong way around. Otherwise not a bad little ship...