This looks very nice, well proportioned and naturally posed.
One thing that needs changing ....presuming this figure is intended for the 1620 /40 period, he should have a high collar on his doublet , underneath the linen collar of his shirt. Low collars exposing the neck like this were NEVER worn at this period. The cup-hilt rapier is also a little anachronsitic : yes, I know they are easier to cast, but that style was only really around ( in Spain , chiefly) from later in the century, say the 1670s. It was always more popular in Hollywood, rather than in the real historical context.
If you want more references, you have only to look at the numerous , dated group portraits of Dutch militia companies that have come down to us , which show very clearly the changes in fashion through from 1600 until the 1660s.