The Sketchy Sketchbook of ....Sketchyness!!

[EduardoGaray]

I hope you are having a good new year mate!
Oh is that the colonel? good, keep going i want to see more of that portrait.
It should be a good practice aswell.
Nice to see the progress in that Spec ops the line was the name? illustration.
The gun is looking good, considering that most people just use a 3d model or photobash that stuff (myself included cough) i think you are doing a really good job.
If anything just take a good look at those arms. The arm holding the rifle looks good, but the other is too small, the hand has the right size but the forearm is smaller than the biceps.
Like i always said, take ref. xD

About the values, i dont think they are particularly dark, this value range would be good to start appling color layers to start the transition to color, but can still push lights and shadows a bit more. If the main light source comes from that building on the background, you could add some rim light to the character and some strategically placed heavy shadows on the face, torso, legs of the character for some dramatic values.
Oh and really good anatomy practice, way to go mate!