Oil leak after engine rebuild

I installed a new piston and new head on my 2004 250X. After I started the bike and ran it for about 10 minutes I noticed oil leaking from the head cover seal. It looks like the head gasket may also be leaking. Everything is torqued to spec and new seals were intalled. Any ideas?

both valve cover bolt grommets in place and in the right direction? valve cover gasket pinched? o-ring installed on exhaust rocker arm rod access plug? o-ring still on valve cover/spark plug hole

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