How do you place a value on a blue boy painting and it is signed but I can read it?

To value a blue boy painting, first research the artist and any comparable works to establish a market price. The signature can significantly impact value, so try to identify it; if unreadable, consult an art expert or appraiser for assistance. Consider the painting's condition, provenance, and any unique features that may influence its worth. Finally, check auction results and galleries for similar pieces to gauge current market trends.