>>1777370You definitely need to work on consistency. There are many areas of the hair going thick to thin, especially at the ends leading into other hair ends. Do not use a single node to go into other hair. Use a two node system so you can handle the thickness better. For the tips of the V shaped hair, the thickness needs to match the rest of the line. If you are making two separate shapes to create the V shape, don't. Make a single V shape line, and make the thickness at the tip the same as the rest of the line. The hair coloring needs to be more red as well, and is missing the highlights. Try upping the saturation with the HSB scale, or finding fanart for better color picking.
For the eyes, you did a good job using the circle tool, but you need to align the eye and pupil. You currently have them crooked. Make it to where they align properly. The bottom highlight within should also follow the underside of the pupil evenly. The little eye lashes should also use the two node system to go into the eye so that the thickness can be controlled. They should also curve more in a particular direction, especially at the tips.
The two blush shapes are inconsistent, with the left being straight and the right being crooked. Use the left blush and make a copy for the right side. The inner blush lines should be a sharper color so they stand out more like they do in the original. The nose should be a small dot like it is in the original. For the mouth, the inner nodes should not be sharp. Turn them into smooth nodes so the expression does not look so severe.
TL;DR: You should probably check out the tutorials in the OP. They will show you how to fix the consistency problems.