All reagarding the face looks awesome, but the hair kinda looks like the spaghetti hair that proko warns us to avoid. I think it is because the hair is disheveled and it's more easy to be a little messy when drawing. If drawing hair in general requires patience, drawing disheveled hair requires even more patience to design it and render it, and if it's sweaty, that just require more knowledge about rendering. Hope this can be helpful.

hey there, just did a quick paintover of your drawing, hope you don't mind! my first critique is that you should focus on the separation of light and shadow more. in the paintover, i darkened whole left side of his face ( from our pov ). a bit exaggerated so you can see it better. in your drawing, the whole mouth area doesn't have a core shadow, so it looks very flat. his beard on the light side should also be slightly lighter than the shadow side. next are values, the bridge of the nose is brightest on the face. everything else is darker. yet youre using that brightest value every where on the face, making the face looks flat. in the paintover, i darkened the eyes, forehead,and cheeks ( though i might have overdone it but it still should be darker than the nose bridge, even just a little bit ) for the hair, i recommend watching proko's video on hair if you haven't seen it yet. in short, try to group hair strands into bigger shapes. don't draw every single strand, design your shapes. another video i recommend watching is Sinix's anatomy quick tips on hair. honestly, i dont think you even need to spend time on the whole background. maybe just part of it, instead, focus all of your energy on the details of the face. and by details, i don't mean every wrinkle and strands of hair, i mean accurate values, proportions, shapes, etc. ( fundamentals ). here's an example by JOHN FENEROV: https://www.instagram.com/p/CPL-qllnK_Z/ the paintover still needs a ton of work and has lots of flaws, but i hope it can give a direction on where to go next with your drawing. hope it helps!

Your line quality already is really good! I think it's just your mindset that you apply it :) Just try to keep up with your practice and you'll become more confident gradually. You could perhaps look into some books of Alphonso Dunn. Your exercises reminded me a bit of them. Keep it up!

Actually, us left handed people mainly use the right part of the brain, which is responsible for the creative thinking. So saying this, us left handed people tend to be more creative! It depends though, of course on how you develop it etc..

Going for the things that you like to create is the best way to stay in the process! You should definitely keep on going. I also like how you added the colours you used on the side, it is a simple, yet great addition. Keep it up!

Who is that naked guy you're taking the poses from?

First of all, it looks great! 3/4 portraits usually are the most difficult and you did a good job. I haven't worked that much with water colours, but a thing that catches my eye is that the washes aren't done that clean, which is probably why there are these lines where the colours haven't properly bled into each other. From what I remember, you either have to wait until the layers are fully dried up or you have to add the transitioning colour, while the paper is still wet. It would be helpful to try it out on a seperate piece of paper. Also, never forget to add the light of life to the eyes. This makes the person look more alive, as the name says :) That is all I can see right now. I hope this might help. Cheers!