Great shot; low angle and 'moving' pose really make it. I do believe it is a Red Knot though, probably a first summer bird since it is in nonbreeding plumage at this point in time. The bulkier legs and body shape/head size are reminiscent of a Knot. Semipals are more stubby peep shaped with darker black legs.
I like the angle, walking pose and eye contact. Adding to the other comments, I would remove the sheen on the bird's left leg. I agree with Doug, it looks like a juvenile red knot.
Nice low angle, pose, and details. Adding to the above comments, I would selectively sharpen the head more. I would also like to see more space in front of the bird.