i think arms look great as is.
seems to be slight discrepancies with lighting direction & strength, compare thighs/arms, beak/hair
thigh: should be lit from above, not just from side. Maybe the shadow edge is too linear?
arms: i like the shading, match legs to this not other way round. lower arm needs shading fix where shadow falls off, needs to turn downwards in a slower curve, flattens arm as is.
beak: fairly strong specular highlight here, maybe out of place for general lighting model?
hair: see comments on beak, highlight may need to be a touch brighter, but looks ok as is.
hands: i like the complete hand, well done. the other hand will need work around folded fingers (as you already know)