I'm new, hi, but honestly Cadence is one of my favourite ponies and I think she looks fine? I've been drawing horses - actual horses, not mlp related necessarily - for years, and her body just kinda looks like a normal horse body which... makes sense? Horses can't be told apart by gender at a glance, and the idea that she has to be super feminine is a bit old fashioned. Plus, you can still tell the art is stylised so it fits quite well! I think she looks really good OP, including her anatomy.
As a side note, I think the shading could be improved but thats just something that comes with experience and practise! The composition is nice and dramatic, and honestly I wish this is how it looked more in the actual show lmao.
Best wishes - Mayhaps