Honestly, I would not advise using images as a background when developing websites in principle. Especially in this particular case, you can do with tools such as the gradient in CSS. Well, either use the SMS platform, but they still need to be able to install, unless of course you do not have hosting services of this type.
For quite a long time I was engaged in this business on film cameras of an older format with absolutely manual adjustment of all parameters. It is now quite expensive. Yeah, and to compete with the same degree with similar firms https://www.splento.com/graduation-photographer-london in their quality level is not possible at the moment.