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Very impressive If 500 points of infantry takes 2 months to complete, and infantry usually offers the worst points per model ratio, you should be able to paint several thousand points of Erehwon armies a year at this rate.
Don't be hard (boiled) in yourself. You did an amazing job! Did you reach your target? Maybe not, but you managed to paint an entire warband of 25 models in a month. That is something to be proud of and happy with!They look wonderful too! They remind me of my first Wood Elf army, way before plastic boxed sets were a thing, though I never managed to reach 25 models painted haha.