If you mean German bombs, then the colours could depend on the type of bomb, and / or the period in question, with RLM 02 being used, as well as a light blue-grey, similar too, but as far as I know, not the same as RLM 76, and a very dark green, possibly RLM 70.
There was often a coloured stripe painted between each fin, denoting the explosive, or possibly type of bomb, with yellow, red or mid green being used.
Again, depending on the size (weight) of the bomb, each fin normally had a brace between the rear edge of the fin, and the end of the (tapered) casing.
However, if you're modelling the French aircraft, would it actually be armed with bombs, of any kind ?