When choosing your website development software (or CMS = Content Management Software), most platforms will offer additional extras at no cost to you. Researching your options is a great idea. Stock images are just one fo the many FREE inclusions with WIX. Although nothing can compete with your own imagery, stock images are useful for all manner of story telling.
WIX gallery options include the following layouts - 1. masonry, 2. collage & 3. grid.
Use free stock images that combine with your own to convey your brand and complete your story.
Other customisable styles include; grid, slider, collage, thumbnails, panorama, columns & slideshow.