it should be work by default, please check you have added the images in the article via image and links > intro image.
If still, you have this issue, send me a temp super user details of the site in private reply, I will check this issue directly on your site.
On your site, you added a caption for intro image that changes the style class and use caption classes.
I removed it from article How Aromatherapy Works
And changed the module on position-3. You can remove it for intro image to show the by default view.
For the category colour, i noticed you already posted here kindly follow the same thread and share complete issue details with support member with site details so he can debug the problem.