Thank you @archsider, the scales were done with some alphas, masking parts, and hand modelling, a little bit of everything, I spend like 6 hours yesterday only on them and they are not finished yet (not even the ones you can see already done).
I still have to do a lot of work in all the body, legs, feets, hands, face and tail are not finished and I have to texture all of them also.
Thank you for the feedback, let me know what you think about my work