A green facings regiment, probably to be the 73rd.
A blue facings regiment which will probably be the 1st. This is because one of my favourites higher units is Pack's Brigade in 1815.
A yellow facings regiment. It's likely this will be the 44th (Essex). This unit is the one that's most along the way to getting finished.
And another yellow facings regiment. I'm not sure who this will represent, perhaps the 30th.