I'll only critique your Dressage shot, as I am a Dressage rider and really quite hopeless at jumping ;)
You have a good basic position and Lego looks to be travelling well, he is forward, hind legs are engaged and he is nicely into your contact.
There are just a few tweaks to be made with your seat.
In the photo provided, your upper body has tipped forward, making your grip your knees and upper legs to remain balanced. Your shoulders are quite stuck, and as such your elbows have come away from your sides. If Lego were to throw in a buck at this moment, you would be VERY lucky to stay seated.
I'd like to see you sit right back on your seat bones. Close your eyes, take a deep breath in, then as your exhale try to feel the two points of your seat in contact with the saddle. This is where you want to be riding. Your upper body should then come upright of its own accord, with your shoulders balanced directly over your hips. From here, allow your legs to 'hang' from your hips. Legs shouldn't be exerting any pressure on the horse's sides, other than feeling like wet towels draping down the saddle. Developing loosing hips is greatly beneficial for this, you need to be able to sit on your seat bones, and relax your legs completely. As soon as you start to grip, you are giving the horse signals constantly, so your driving aids start to become blurred.
Allow your arms to relax, drop your shoulders, and allow your elbows to sit along your sides. Ideally - and this takes a lot of work on building muscles and flexibility - you will be able to have your elbows sit on or just above your hips. In this position, your lower arm is free and loose, so the horse becomes more confident in your ability to provide contact. You will also be sinking more weight into your seat bones, creating a highly stable position from which you will be able to effectively direct the horse with your seat. And, should the horse throw in a buck or spook, you're very unlikely to be unseated.
Your elbow acts like a hinge, the upper arm should not move from its position along your torso, while your elbow moves with the horse's topline in walk and canter. If you can master this, you will develop excellent contact and a much better feel.