Fairax's Regiment of foote officer
Looks good although one minor point, he should probably have an orange sash for Parliament as red is the colour usually associated with the King. There is some controversy though as I believe Fairfax was with the Eastern Association and may not have worn the orange sashes of Essex's army.
EDIT: I just noticed as well that he is wearing two sashes, one around the waist and one across his shoulder, I believe it should be either one around his waist or one across the shoulder. I don't think there was a particular system for wearing sashes, in the Napoleonic Wars it was sashes around the waist for officers and sergeants apart from the highland regiments who wore it across the shoulder. Personally I would give the ensigns the sash across the waist and the officers the sash across the shoulder, although you could alternate it a bit between regiments.
It looks like that the sash was also worn the other way on the shoulder (for officers in the infantry at least, maybe sergeants wore them the other way?) although of course I doubt there was a uniformed system for the wearing of sashes:
I apologize if I am being picky but as a historian I will continually be looking for things from the wrong colour tunic to the slightest button out of place!