I am sorry I looked at your picture without noting the title included "sea," and assumed that a lake was being portrayed. I do believe that this image would work great as a lake, but could be from the Pacific NW coastal region where I live. I think that the rocky shores along the puget sound area and further north into BC would show coverings of seaside flora and fauna as you have presented. I still think (like the two previous posters) that your foreground needs a lot more more work. Moodflow's coastal rock formation image is in my opinion the best coastal rock texturing job I have seen so far, and would be of great benefit to anyone attempting TG2 seaside rock structures.