If you use the upload button to add an image to your post, a preview of your image will not be shown, instead there will be a link to your image for other people to click in order to see your attached image.
It's better to drag and drop your images into your post. This way it will be uploaded and displayed right away when people view your post.
We look forward to seeing your final work lit with HDR Light Studio here. Please do tell us what 3D software and renderer was used also.