CREATE TABLE table_name_18 (userpics_free VARCHAR(255), name VARCHAR(255), registration VARCHAR(255), yearly_cost_for_paid_account VARCHAR(255))
What is Userpics Free, when Registration is Open, when Yearly Cost For Paid Account is "unknown", and when Name is Kraslan?
    
SQL: SELECT userpics_free FROM table_name_18 WHERE registration = "open" AND yearly_cost_for_paid_account = "unknown" AND name = "kraslan"