Cable from negative side of solenoid to B+
Not sure what you mean here ??, but it's not right
EDIT: I think you mean, the small post, blue wire as neg, and refereeing to the large post on that side of the solenoid?, then yes it looks good
Both large post on the solenoid are POS +
Cable from B+ to A2 on the motor
Cable from M- to A1 on the motor
Cable from B- to negative on battery pack
Cable from positive side of solenoid fused to positive on the battery pack