The right arm is in the wrong position. You have used the dismounted "carry swords" where the arm is paralel to the ground, the position of the arm for mounted "carry swords" is with the hilt of the sword resting on the thigh. Also try to place the sword hilt behind the wing of the boot, as it is now would destroy four hours work!
If you need any information I have a bit.
Sergey, that is a trooper of the Blues and Royals (Royal Horse Guards /1st Royal Dragoons) our junior regiment! He is in the position called "sit at ease".
Notice how the helmet is fitted above the ears and pulled forwards so that the peak almost touches the nose. Other than the colour of the uniforms, some other regimental differences to watch for are, The Life Guards plume is shaped with an "onion" at the top and we wear the chin strap below the bottom lip. RHG/D shape their plume to be as small as possible at the top and they wear the chin strap on the point of the chin. Obviously the sheepskins are different colours but The Life Guards also have a blue edging where RHG/D have a plain sheepskin. When you come to paint the figure, notice that on the cartouche box is a brass badge in the form of Her Majesty's coat of arms. The Life Guards have a piece of red cloth forming a "light" showing through the badge, for RHG/D the badge is worn directly on the box.
Martin