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mm well that depends, example for the city, that was like 3 hours, I suppose, and for the gemini it was the same and the vivi was less, like 30 minutes, I do not take the time xd but I will try to count it for the next pixels

Thanks :) I have wanted do something bigger and i spent about 30 minutes on something like a sketch xD so... i need more practice.
Your works are awesome :D

jaja thanks very much! yeah for someones I use a sketch and yes all in this life is practice xd but remember the pixel art all is about the details so you can do it, just try it!