Before people read what you are about they scan your design and images. If your images are not communicating that you are a professional and that you care about what happens to your customer you will lose customers.
As a web designer I know how important it is to have images that communicate and are professional. If I just grab images from Google I will look like I don’t really care about what I do. Sites that use images like that are basically saying they are lazy. I work hard to make sure I am not saying that. I even traveled to Alaska to get the shots I needed for a client. No journey is too small.