It's hard to tell much from one picture, but here's what I noticed:
Your heels are down nicely, but it looks like your toes are pointed out, therefore losing your knee contact. Try to keep your toes pointed straight forward, and even if that causes you to lose a little drop in your heel that's okay...you've got some room to spare on that. Make sure your thumbs are pointed up (it's hard to tell from this picture), and try to get a little more bend in your elbow, this will bring your hands up a little and will feel funny at first!
I also want to mention that you have a pretty good line from shoulder to hip to heel! So overall, your position is pretty good...looks like you're maybe very slightly tipped forward in this...but it's barely noticeable and could be you just moving with the horse's motion.
Now, if you're riding hunter/jumper I might be wrong on the leg critique...I know most hunter/jumpers ride with toes out and heels way way way down.
I can't see anything in your last post! I think the horse is cute...again, can't tell too much and I'm not too great with conformation anyway...looks fairly well built though. Looks like he MIGHT be a little downhill, but that could also be an eye trick because of the saddle covering the wither area. Nothing jumps right out at me as a bad conformation trait...so that's good.