Rogerio,
So you have moved into Guard now, just remember that painting a Guard army is a marathon and not a sprint.
Nice scheme and painting on the infantry squads, very good colour scheme that works well with the bases and the hats separated by the blue and brown. Makes them look almost Napoleonic.
One suggestion for the tanks is to perhaps dry brush first as the extreme edge highlight you have used sort of looks a little 'rough'. I would use a very light dry brush of a blend of your base colour and highlight colour to try and reduce the rippled edging you have on the tanks.
Keep up the painting war,
CB