Expressionist-style portrait in the manner of Constantin Razumov

This rectangular artwork features a portrait of a young girl with an expressive, painterly style. The subject is depicted with realistic facial features contrasted against fluid, swirling brushstrokes in shades of mauve, ochre, sienna, and cream that form her garments and a voluminous headpiece. The owner identifies this as a reverse painting on glass; while the surface appears reflective, this physical medium remains unverified without manual inspection. The work bears a signature in the bottom right corner that appears to read 'C. Razumov' or similar, which is stylistically consistent with modern Impressionist or Expressionist works attributed to Constantin Razumov, often characterized by soft-focus faces and vigorous brushwork. A number '905' or similar is visible in the lower left corner. The composition uses a warm palette with a hazy, atmospheric background. The edges of the substrate appear clean and unframed in the image, showing no significant signs of wear, though there is a slight glare on the upper right surface. Verification of the artist's hand and the reverse-painting technique requires professional authentication as signatures can be replicated on mass-produced prints or by other artists working in a similar style.

Based on the digital image provided, I am examining a portrait of a young girl executed in an expressive, painterly style. Per the user's submission, this work is identified as a reverse painting on glass and bears a signature in the lower right consistent with the hand of Constantin Razumov. While I can observe the fluid brushwork and the characteristic 'soft-focus' facial rendering typical of his compositions, I cannot verify the medium or the signature from a photograph alone. A physical inspection is required to determine if this is a hand-painted work on glass or a high-quality print transferred to the surface. The signature and the '905' numbering appear consistent with modern Russian Impressionist market trends, but such markings can be replicated. My valuation of $1,200 - $1,800 assumes the attribution to Constantin Razumov is correct and that the work is a hand-painted piece. In the current market, works attributed to this artist are sought after for their decorative charm and technical skill. However, if physical examination reveals this to be a secondary reproduction, a mass-produced print, or a work 'in the style of' rather than by the artist's own hand, the value would likely decrease to a decorative range of $100 - $300. To confirm the identity of the artist and the nature of the medium, I recommend a professional in-person examination by a fine art specialist and a review of any existing provenance documentation.