Che
Mr. Guevara was an inspiration for revolutionaries of his time and onwards, however professing to be a Marxist pretty much negates any positive message you may have. Marxism in and of itself may not be all bad, but socialism is particularly abhorrent, as it is a dictatorship by any other name (not as though any political movement isn't.) where the government (see: dictator) owns and controls everything (see: Any and all government policies, parties and or movements). Personal possession becomes imaginary, and any government that is big enough to provide everything for it's people, is damned sure big enough to take it all back when that time comes. Remember that.
As for the picture itself, there is admittedly a lot to be desired, however you did nail down a "likeness" in the very least.