Oil painting of roses and 2 bumble bees by Velma McCall 1928

This is an oil painting on canvas, unframed. It has a few different color roses. It is signed Velma McCall '28. This was purchased in Oregon at Richardson's Art and Gift Shop and has the sticker on the back of the painting. My mom took a picture and sent it in to sotheby's about 20 years ago and they estimated it's value to be $2,500. I would like to get a few opinions on todays value and where to sell for a fair price.