Is nice, you can improve the sky making highlights and shadows to give more volume to the clouds :).. also some of the tail’s hair behind the brown horse..:)
"...when someone gives a critique of your work, fear not. It usually means they like or care more of your work than when they just pat your back." - Tiago
The surrounding countryside, bushes, trees etc. are excellent Christel. I think the horses are slightly wrong. The brown horse has a very short and small head and the grey one looks more like a donkey. Perhaps a tweak or two would be in order as this has the potential to be a very nice painting.
Chammi
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My eye tends to get drawn to the far hills /skyline division more than the horses..
Maybe soften the far hill line and define the horses, color/contrast and a little more shadowing under them to set them down..
Nice bg maybe too good that it distract from the horses unless they were larger I agree with Chammi the brown horse head seems small.Maybe accentuating the light on the horses will give them more presence
I did a simulation for you I hope you donot mind I also add some haze to the distant hills and trees to concentrate more on the horses