Sorry if I'm late in responding, because of the time zone difference between us, I'm sorry I'm not allowed to provide personal contact to clients until this contest ends. if 600 is a development of my design there can be a sign of changes to the design that has been provided by the site or can send it via private message. if the 600 design you mean is general, you can submit it at the design briefing.
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And please check update for some 600 designs #162 #163 #164 #165 #166