Great start Claudio, really! I agree, no mute when you can, so you can work with actual tone. It looked like maybe you could tighten up the bow a bit. Nice independent fingers on the left hand and bow grip looks good. Use the bow fingers to ‘squeeze’ the bow for more weight into the string. It doesn’t take much. Experiment with how much ‘weight’ you need to make a good sound. Last thing, what kind of strings are you using? They sound like steel, and maybe a new set of Red Label Super Sensitive strings would be a good investment. Thanks for sharing!