How to portray a Spartan king from the classical era?

[Ghostmojo]

... I've read somewhere that the Thespians as black coloured soldiers isn't accurate, is this really true? (Following picture not being accurate?):

This picture is from this book which I have in my possession, Peter:

<!-- l <a class="postlink-local" href="http://www.romanarmytalk.com/rat/viewtopic.php?f=39&t=25893">viewtopic.php?f=39&t=25893<!-- l (Thermopylae 480[size=85:19mbmxw8]BC[/size]) where I tried to get a discussion going

It has an accompanying volume which is also interesting:

<!-- l <a class="postlink-local" href="http://www.romanarmytalk.com/rat/viewtopic.php?f=39&p=246222#p246222">viewtopic.php?f=39&p=246222#p246222<!-- l (Marathon 490[size=85:19mbmxw8]BC[/size])

Both have been produced by Greek authors/academics who presumably have researched their topics well. I'm wondering what Stefanos and everybody else thinks about these books (which are similar in size and layout to Osprey books) produced by Periscopio Publications. I found them to be very interesting but cannot say for certain how accurate they are.