#6: we prefer a white background, nice used of a shutter for the O of hipoflex however the design of the shutter could be improved. We feel it resembles a flower, not exactly what we are going for. Font seems a little bland
#5: similar comments to #6, the large shutter makes it look even more like a flower
#9: looks great, like the 2 color X, we'd like to see what it would look like with the shutter the same size as the letters, as in #8
#10 clean and simple, looks good. Add the slogan as in #9
#8 not a big fan of the line
for #9 and #8, could you make the shutter resemble the one in the reference file red.jpg but without straying too far from your current design because we quite like it