Wooah so many posts since my last one… will try to catch up on the comments… hope it can help, but dont take these too seriously, if you think Im wrong with what I say please do tell me or dont pay attention to it. 
Agostinuke - Cool to see some 3d again. Great study.
paintdabs - nice sketches, love to see those “construction” lines
Rebecca - I am currently typing this in a WordPad, will copy on the reply page when I will be finished with it. This will never happen again, Ive learn my lesson
Thanks for the nice words about my gifs again! … so where are your studies, havent seen any since a couple days no?!? 
PaulAherne - Nice one. There is just a little something with the small finger… I think compare to the original its just because yours is going a little too far from the rest of the hand. About the colour picker I would also suggest trying not to use it… at first it can be hard but youll get used to it faster than you think. Just try it!
anandpg - loove your sketches and those curvy shadow lines. Simple yet very effective!
Art2 - nice clean outlines… maybe the hand is a little bit too slim or too long. How is it to work with Artrage? I always wanted to try it!
Balduran - Proportions seams ok to me… its just those last 2 fingers who should start before the others I think, they seam to start almost at the same place on yours… I am sorry I do have some problems in english when it comes to express myself appart from usual talk
Well hope you understand. There is also a good demarcation between the thumb and the hand that is absent on your drawing… adding that would help too!
NoirQ - Looks good! Keep going!
Windroll - Nice studies! Love especially the day 02 and 03
Saphires - Good start! The thumb seams a little twisted or something… but still great start. Love the shading.
Monica - Thats good! Would be great with some shading 
ratheesh300 - Wow! very nice… nothing to say
embryotic - I really like this. Love that you did more than just the hand though 
NR43 - Very good I think!
xstijn - where you see mistakes and things to improve I see still a very nice drawing! Keep going!
jaya6v - Good one… would love to see that hand in a nice pose!
Agnaldo - Oh thats great, lots of different style! Very interesting
bdh-art - simple beautiful hand studies 
GreenDuckie - Thats good!
Kirt - Oooh I really love it. Very soft and delicate… beauuutiful!
Quadart - Superb… really like the little kid 
RockstarKate - Thats cool, interesting style! 25, you can do it!
ooooh sorry Im gonna have to stop here, otherwise It will take the entire night 
Want some time left to draw! 