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Hopton's personal standard was a cavalry cornet rather than one of the company colours carried by his regiment of foot.His regiment of horse also had red colours but I think his personal cornet was red with a pair of crossed cannons.
Timmo is right about the Second Captain's colours you have painted. Two stars indicates the 2nd Captain's Company.
One of Hopton's colours was captured at the Battle of Torrington and it had written (I assume painted rather than sewn) on it "I Will Strive To Serve My Sovereign King".
Another source for details that might have been found on personal colours would be the family heraldry. For example, Waller's own cornet is well known. I guess with patchy information at best if you wanted to have personal colours to mount with the officer figures then without any other reference to use I'd research the family heraldry.