Ok,
Here’s my view,
The Face: The hair needs to be outlined to frame the face from the side burns to the top of the head along the band of the hat. The eye brows also need to be outlined to help frame them. The moustache also needs to be framed as well. This help give additional character to the face, The creases in the ears also need more definition. I usually use my darkest shadow plus black to make these areas pop. The ears also need to have highlights. Please look at Jaume Ortiz’s SBS on painting a face located here:
http://www.planetfigure.com/painting_faces_acrylics-jaume_ortiz/painting-faces-acrylics.html
The Eyes: also need to be frame to avoid the “Popped Eye” look that Marc refers too in the earlier post: I like Mark Bennett’s tutorial on painting eyes. On a 54MM there are slight differences but it will get you where you need to be. It is located here:
http://www.planetfigure.com/pages/Mark-Benette-Eye-Tutorial/
The Blue jacket: looks fine for now.
The red shirt: needs a lot of work: It appears to be a monotone color: No Hi’s or Low’s: The collar next to the neck should be outlined with a Mix of you deepest skin tone with black or Cavalry brown to clearly separate the shirt from the neck. Next the Collar should have been Highlighted at the top and the indention in it should have a deep shadow. Next you should have outlined the collar with a deep shadow. Ro accentuate the difference between the main shirt and the collar. The shirt should be a range of color from top to bottom. Highest Hi’s at the top with a darkening gradient to the lower half of the shirt. This is accomplished by using a glaze or using thinner paints with darker colors: I know that a poor description but perhaps someone else has a better description of glazing.
The Pants: Also need to be a gradient of color. Hi to low. Think of how your light falls on the figure when looking at it when standing above the figure looking straight down at it. Look up Zenith Lighting. The buttons on the pants need to be outlined and painted a different color. You can still see primer on the pants near where they are tucked into the boots. Use to many different Hi’s and Low’s on the paints. Deeper shadows Higher Hi’s.
The Gun Belt: The belt doesn’t look too bad. You started to get the idea on the leather with the nice hi’s on the front of the holster. That needs to be repeated on the top edges of the holster and belt. Outline the Holster to create the effect of depth.
The Boots: All I see on the boots are the base color and one Highlight. Again think about the boots having higher or lighter color at the top and having darker colors in the seams and creases. The Heels should be a different color than the base.
I hope this helps and keep it up. The only to get better is to paint more figures. It will all come together in time.