Database project template - Dynamically control size of image fields

Hopefully someone can help me with this.

I have a database for projects and on the template I am pulling in Images from fields. The problem I am having is that the client wants to be able to change the widths of the photos. eg. set them to 100% width and others 50% width. So I need someway to control the widths so that each project can have images of different widths.

Please see this link http://arco-designs-v2.webflow.io/project/industrial-shed-conversion