Hi Sabina. Here is a quote regarding Nitrogen deficiency:

Lower leaves first appear pale green. The leaves then yellow and die as the N travels to support new growth. Eventually the deficiency travels up the plant until only the new growth is green, leaving the lowest leaves to yellow and wither. Lower leaves die from the leaf tips inward.

That does not exactly appear to be like the symptoms shown in your pictures. I am not sure what the yellow dots might be on your plant. Is that the only plant with those symptoms?