* The style of the painting: Does it resemble a specific artist's work?
* The signature itself: Is it a full name, initials, or a symbol?
* Any accompanying information: Is there a label, certificate of authenticity, or other documentation?
Here are some steps you can take to identify the artist:
1. Research the signature: Look for the artist's name or initials online, in art databases, or in books about the artist's work.
2. Analyze the style: Compare the painting's style to known works of different artists. Look for similarities in brushstrokes, color palettes, or subject matter.
3. Consult an expert: If you're unsure, consider contacting an art appraiser or a specialist in the type of art you're looking at.
Once you have a better understanding of the painting's style and signature, you'll be in a better position to determine who "Riki" is.