Sander said:
The problem isn't accuracy or faithful depiction of the in-game models, because I personally feel most of it is quite close to home. However, the problem lies with the style: it is again nowhere near the 50s comic book style (DC comics is often used by Rosh as the archetype). The style used here is more of an 80s anime style, somewhat caricaturised even.
Hence, good drawings, wrong style. These feel like a 'modern-day' adaptation of Fallout's graphics, which is completely and utterly wrong.
This sums it up perfectly, if you ask me. Rosh is quite right when he refers to 50s DC comics: that's the style you need to emulate. More fundamentally, though, it is a matter of picking the right tools. I see you have used pencils and possibly some sort of pen (be it a good ol' fashioned pen nib or a modern marker). I'm guessing you used a computer to colour in the greytones in the first drawing. Maybe you used software on the other drawings as well? Anyway, I would strongly advise against using any of those tools if you want to emulate the style of 50s DC comics, except maybe for a simple filter when the handdrawn image is completed. Use either a brush or a pen nib with Chinese ink. I'm not kidding. The artists of those days used either the classic Winsor & Newton Series 7 Finest Sable #2 brush (or #1 if you're like me and you make rather small drawings) or the legendary Hunt Round Pointed Artist Pen #100 (use #102 if you want finer lines - the metal is harder, so you need more pressure to get fatter lines). These tools were the norm and really defined the style of that period. Other tools were also used, of course, but pick these and you will need less effort to emulate that style. The brushes are a tad expensive, but they are the best you can find on this planet and if you treat them well, they will last extremely long.
Also: instead of colouring with a computer, you might want to consider using opaque watercolours. Children often have a set of these, because they're deadcheap and you can make really awesome pictures with them. If you can afford them, you could use quality watercolours (Winsor & Newton makes them, but so does Dayler-Rowney and they're just as good yet cheaper). Those are more transparant, though, so the effect is most of the time entirely different, unless you use very little opaque watercolour but then it will not be as nice. Anyhow, better materials will always get you better results in art, but there's really no need to do so here, because a lot of 50s cartoonists (Arno, Chas Addams, William Steig) actually used the deadcheap version. I think that in the USA they call it posterpaint. They used that because it often didn't matter what the colours looked like: the cartoons were most of the time printed in black/white/greytones. You could of course try to copy the colouring of 50s comics (primitive pixelated colour mesh), but personally I think that posterpaint would work very well. Then you could scan it in as a black/white/greytones pic, maybe adding a cartoon filter to brighten up the black. Or you could use washed ink and get a similar effect without having to add a filter.
If you plan on doing Vault Boy drawings, use the same tools. I do, and I come pretty close to the original, I think. The style of Vault Boy is not 50s DC comics, though. It's more early William Steig/temes/50s New Yorker/Peter Arno/Whitney Darrow, Jr. - a style brilliantly copied by the modern day cartoonist Seth (Chris Ware is able to do it just as well, but it's not his hallmark, he uses many different styles).
</center>
. 
