Alright so I felt a bit bad about just complaining and not providing anything of value really, so I did paintovers for everyone. Hope people don't mind.
>>324
You also suffer from the bg and rimlight being too similar in value, though you have the added bonus that you played up the colour temperature a lot so it still reads. That being said I made the light on his skin just a bit brighter anyways. Your whole image is a bit blurry–I'm not if you are working very small and increasing hte size, or if you are using soft edged brushes. Anyways, I used a hard and opaque square brush to just give some edges a cleaner and harder edge. I think it helps the image read better and look a bit more finished.
>>349
Not bad, I can see you are really thinking of the structure a lot. There are a lot of lines though that are confusing and not conveying information well, also your proportions are a bit off. I would do your linework in stages–rough lines on a layer, then lower the opacity and do a cleaner set of lines on a new layer above, you can repeat this process a couple times if you need to. So yeah, I just did some cleaner lines with a bit more simplification and planar emphasis on top. You can also hint as some shadow shape type stuff if you want, I dunno what approach you like.
>>323
This is pretty nice, I think you nailed the proportions better than the rest of the people in the thread. The values on his body too are fairly accurate, my little nitpick is the background you've made too light. Even when just focusing on the body like this, you should always be thinking of the whole image to an extent, and this includes how it reads on the background. So like, even though the value of the rimlight is pretty accurate, the value behind it is wrong so the image loses impact and the arm started to become a bit lost. In some cases you may do this on purpose, but in this case I think that bright rimlight on him is the most interesting part and you want it to "pop". Notice how much better it reads with just a slightly darker bg value? I also threw in a bit of texture. Maybe it's not necessary, and I did it pretty lazily, but it can be a nice thing to try to start incorporating in your images. There's a bit of noise right were it turns from light to shadow on his skin–there's a sort of speckly texture to his skin that shows up around hte terminator line. The blood spatter also is more textural in the photo. So I just used some brushes that sort of have this look already and quickly dragged the brushes along. If I were doing it for real I would use more brushes and do it more carefully and subtle.