Paul Morel, the central character in D.H. Lawrence's novel ‘Sons and Lovers,’ is a complex and psychologically rich character. His character undergoes significant development throughout the novel. 

Oedipus Complex: One of the central psychological themes in the novel is Paul's Oedipus complex, which is a concept from Sigmund Freud's psychoanalytic theory. Paul has an intense and complex relationship with his mother, Gertrude Morel, which borders on the Oedipal. He is emotionally attached to her in a way that goes beyond the typical mother-son relationship. This attachment influences his relationships with other women and creates internal conflicts.

Artistic Aspirations: Paul is deeply drawn to art and expresses his emotions and desires through his artistic pursuits. His passion for painting is a way for him to channel and explore his inner thoughts and feelings. This artistic inclination is a crucial aspect of his psychological makeup, reflecting his need for self-expression.

Ambivalence and Conflicted Emotions: Throughout the novel, Paul experiences ambivalence and conflicting emotions. He is torn between his love for his mother and his desire for independence. His relationships with Miriam and Clara are marked by his inability to fully commit due to his unresolved feelings for his mother.

Sexuality and Repression: Paul's journey to understand and express his own sexuality is a central element of his character. He grapples with sexual desire and repression, especially in his relationships with Miriam and Clara. His mother's influence, societal expectations, and his own insecurities all play a role in shaping his sexual experiences and desires.

Conflict Between Social Classes: Paul's working-class background and his aspirations for a more cultured and middle-class life create a psychological conflict within him. He struggles with feelings of inadequacy and alienation as he tries to bridge the gap between his roots and his aspirations.

Self-Identity and Autonomy: Paul's search for self-identity and autonomy is a recurring theme in the novel. He grapples with questions of who he is and what he wants in life. His desire for freedom and individuality is in constant tension with his strong emotional ties to his family, particularly his mother.

Depression and Mental Health: Paul experiences periods of depression and emotional turmoil throughout the novel. His inner struggles and the weight of his relationships contribute to his mental and emotional state. This is a significant aspect of his psychological makeup and contributes to the novel's overall mood.

Maternal Influence: Gertrude Morel's influence on Paul's psyche is profound. Her possessiveness and emotional dependence on him have a lasting impact on his emotional development. His sense of guilt and responsibility towards her shape many of his decisions and conflicts.

Paul Morel is a character who is deeply affected by his upbringing, family dynamics, and societal expectations. His internal conflicts, especially regarding his mother and his artistic aspirations, drive the narrative of ‘Sons and Lovers.’ D.H. Lawrence explores these psychological aspects to create a character who is both relatable and emblematic of the complex forces that shape an individual's life and choices.