This tile really goes back to utilizing the basics. Draw a string, fill with tangle patterns, shade. and sign. The string here is Sting #21 - which can be found on tanglepatterns.com.
The tangle patterns used are Struzzle (incorporated into the string), Sugarcane, Summer sitter, Sundoo, and Sunflower. The S theme is because the string is courtesy of Sue Zanker.