hmm...good work on all of them, i like hte first 2 and the last one the best
now for the crit..
the third one, IMO, could use some depth, and perhaps more varied colors, or better use of the white and red.
on the 5th one, the text isnt quite aligned with the perspective of the picture you used.
on the second one, if you made that into like a cross section of a pipe, or made it look more like a pipe or a sewage line as in give it that rounded look. you started doing that with the black circle, and the yellow-orange around it, now finish the idea.
thats all i got, hope i helped :)
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