Very nicely done! And I won´t go into the "Georges Remi was a collaborateur" controversy, I promise!
Good, because he wasn't.
Tintin is from Copplestone Figures.
Captain Haddock is a Brigade Games figure with a head swap from another, they're both merchant seamen. I've given him a bren gun.
The Thompson Twins are two Winston Churchill figures from Amazon Miniatures (with Thompsons). I added the walking sticks and removed the cigars.
Calculus is a WestWind London Detective (Jack the Ripper set) with added umbrella.