I'd like some constructive criticism on this piece please:

Lovely! The only thing I would say is that the flowers in the background are a little bright and attract attention away from the horse. This is easily fixed by adding a feature to highlight the subject, such as a vignette or blurring around the edges.

Yes auctions are good but I will say sometimes pieces go pretty cheap. I've snagged a few 80k-ish value pieces for 20k. I would also price yours somewhere around 70-80k. It's a very clean piece but there's not much editing (work) put into it. And there's nothing wrong with that! It's just the amount of work put in helps factor the worth of the piece. One suggestion I have is to maybe add a few more highlights to the tail. It might be because I'm on my phone, but the tail looks like a dark spot and it blends in with the shadow underneath. Very nice art overall though ♥️

it looks really good! But i would say to make your white lines on the horse less harsh..

This is really cute! It would pop a bit more if you would add some color to the eye, other than that, I love it

I live this oeice, not too unrealistic and not too realistic either, its just right in the middle