Find a contact button on the site you seen it at and ask them for permission or information to contact the artist for permision to edit the image with full credit.
Why doesn't someone just take their own figurine and take a picture from the perfect angle to get as many of the armor parts as you need in the picture? Then whoever makes the armor progress thing can just make a vector of the toy marine? No rights violated, way easier, and it'll get you exactly what you want.