its been a long time coming but very happy with all the choices

I would personally choose either a red brick or stone brick. The red brick will bring a classic look to the exterior while a stone brick will bring more earthy and “lived in” character.

fantastic idea

There's a lot to take in . It is pretty quirky , but it has potential to be interesting . I'd leave the brickwork as it is , and the windows are windows -- you say they need replacing soon -- they seem okay to me . I'd quite like darker brown timber windows , but I don't know of many people that have 'reverted' back to timber -- I assume it can be done ? The back door is easy -- its screaming out for a deck in a darker wood ( or darker stained ) , but even then you could have fun , with seating built around part of it , or even a barbeque or similar built unit on the edge -- in a similar light brick , or stone . Personally , I wouldn't do a pergoda or similar over it , mainly because of the studio -- it takes away too much sun and too much open space . Likewise , a modern terrace with glass sides would look out of place . The entry door IMO is not too bad -- it works . The concrete steps let it down -- black or charcoal outdoor tiles would lift it , and look good . A stainless handrail would be the go too -- it'll look out of place until its 6 months old and starts to look 'aged' . The addition to the right needs darker mortar to make it look integrated . The roof looks okay and period in that green , so depending on how much can be reused , maybe stay with that . Or go charcoal , or even orange would suit . The shipboards in crisp white . That leaves just one thing needed -- some colour ! An orange roof with bright orange gutters would lift the whole place ; green with an almost fluro crisp green gutter colour likewise ; charcoal roof with bright red gutters ! Just enough to lift the look , even for people who don't like much colour ! I'd also do the main body of the gables in the same colour as you chose for the gutters , or maybe 1 or 2 shades down .