I really like your painting! I would be happy to put you on the edge between intermediate mid tier and high tier. Since you haven't received any answer yet, allow me to give you some feedback.
With regards to hues and values, there are three basic ways to add contrast in an image: hue, saturation and value contrast. In general, it is desirable to have some contrast in an image, to
add points of interest, and make it more lively and interesting. If one or two types of contrast are lacking (for example the image is monochrome, with very limited colours, or very low contrast)
there are the other types to make up for it.
In your image, you have a very limited colour palette: the greens are very dominating in this image, and very close together in hue and saturation. Together with the warm reds, it makes this image
very monotone. It's all very warm. Secondly, all of the colours in the image are quite saturated. Even in the shadowy areas, the saturation is quite high. I personally think your tonal values are
good. It just feels very contrasty overall because of this high saturation.
So what I would suggest is introduce some cooler colours, some soft blues and purples, for example in the darker, shadowy areas. Secondly, reduce the saturation in certain areas, especially
in dark and background areas. finally, if you think it will fit your style, you might consider a little bit of rimlight whenever dealing with wet / shiny surfaces, besdies specular highlights, which
you have already, of course.