Hope this is the correct forum for questions such as these.
The attached screenshot was generated with a single image (title background, triangle and box border) and text inserted using the place function. I’m trying to build it using showybox or grid (with the triangle image loaded on it’s own), but am not quite managing.
The thing you might have to tweak around depending on your image is the offset of the image in line 3 (dx and dy in move).
If there is any question left feel free to ask