Go over to the right arm and get rid of that middle line at the bicep,
making the same welds and edge turns you made on the bicep of the
left arm.
I had you keep this vertex at the middle of the outside of each arm
instead of merging it because it helps add shape to the upper arm:
Unfortunately, when you check the face count in Summary Info, it’s
1,658 — still 158 faces more than you are allowed. So you’re going
to have to sacrifice the shape detail by welding that vertex to the
one below it on both arms.
428PartII/Modeling
Turn the long edge on the ...
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