He's looking good! Looks like he is about to shed. Only thing I have a question about is, do you have a electric thermometer/hydrometer? I see the analog one in the first two pictures. I suggest you getting an electric one, they are more reliable, and correct.
Well, in all of the pictures except the third one, his colors look gray, which is usually the shed on top. Crank up the humidity a little bit, it will help him with the shed.