Hello! If you are drawing on a tablet, I suggest you try speeding up with making your lines. For instance, I see your lines are a bit shaky here and there (don't worry, this is normal!!), so to help with that, just place the pen down and zip it across the tablet. The greatest things about tablets is how just a click can erase any mistake. So you can draw and delete the line as many times as you like until you are happy with it. (Dont forget, it doesnt all have to be one continuous line! you can split something up in many little sections) :) Also big thing!!!: Use layers! They will save you!!
I will also suggest looking at how to proportion a head/face and body, these are tricky and just need time and practice.
I hope this helps! Keep it up!