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There are too many thin lines. If you're going to use it web-only, it's important to still look good after resizing it quite a bit. With lines like those it's not realy the case. The white lines inside the mark could be drawn to better accentuate the flow of the 8. Now they look kind of misplaced.
I really like the colours, they look great!
Unfortunately the typeface of the "Infinitum" is unfitting and looks cheap. There are many high-quality free fonts out there, try to find a more refined font.
Keep working on it and it will really shine!
