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. If you want it to be in isometric, though, the lines would look cleaner in steps of 2 (rather than 2-2-2-1-2-2-2-1 etc.), plus it would be easier to get those nice sharp 90 degree corners. The circles (particularly at the top and bottom) have some jaggies that could be cleaned up as well. Hope this helps 
i find isometric circles hard on a small scale LOL! you pulled it off ok on a large scale.
few lines could be cleaned up abit, and like MP said. use isometic for letters instead of 2-2-2-1-2-2-2-1