Nice study @eleftheria_arts! There are some proportional issues in your figure, and I think they are exaggerated by the fact that the torso was drawn and rendered so well. The first thing I did was enlarge the head a bit and then tilt it back (I forgot to mention that I happened to have had the reference of this exact image on pinterest haha). The left arm (viewer's left) was made to small, and I think this may have thrown off your proportions for the legs. I enlarged that left arm to match the proportions of the body, then lengthened the legs and enlarged his feet just a tad bit. Making sure to double and triple check your proportions before moving into a full render is a good way to save yourself some headache from having to fix these when you're further into the drawing process! Hope this helps!