First pic- your overall position looks pretty good to me although it's hard to tell from the angle of the photo. Seems that your leg has slipped back a bit but it also looks like you jumped ahead which is probably why. I like your release, looks very good.
Second pic- your position looks better in this picture. Leg is better, still a bit slipped back but better than the first.
I think you may look an eensy weensy tiny bit big on him but I had to look really hard. It doesn't jump out at me. He looks like he is carrying you fine so I wouldn't worry about it. Your leg looks very good lengthwise on him and that's what counts more than anything (IMO).
You two look like a great pair. Cute pony! Love those bays with white stars! ( I have two!!!!)
First of all I have to say I wish I had your legs! It seems like in the first pic they have slipped a tiny bit, but the second one looks much nicer. I also love how you don't come to far out of your saddle too. You and your pony look great in my opinion, but I look big on the horse I ride so maybe I'm just used to it.
I wish my leg slipped back that much!! When my leg starts slipping back in terms on centimeters instead of feet, I'll be in good shape. You look fantastic. You look a little big on him, but nothing to where it looks like it's time get a bigger horse. I can't tell from the picture angle, but since your stirrup length looks good, maybe your pinching with your knee just a little instead of distributing your leg evenly along the girth which is causing you to jump ahead a tad?