This time I had an extra LED light and a Reflector with me. The images is still relatively dark because it was not very sunny outside at that point but most importantly it was lit more evenly.
In addition to that I had three times the amount of towels with me (6 extra large luxury towels) to make the shell appear bigger.
It still looks quite small because of the angle but it was impossible to get more because I was struggling a lot carrying one IKEA bag full of towels and other requisites, a set of LED lights, the Reflector, Tripod and Camera.
Having said that I really enjoyed this photo session a lot and am very pleased with the results.