Looks: The power from the silmarillis gave the Noldor several features that changed their looks. First of all it enhanced their hearing to higher than normal levels (more than detail, they can hear lower volumes better than normal people and they can hear lower sounds further from them than normal people but still not to the levels of Sound Release Inner Sonar Skill) but in doing so it gave them all pointy ears. The next was it helped them grow to be more pure and in doing so changed their bodies, they would be taller than normal men but not by much, they were always well build with muscles with near perfect skin. They looked fair is the only way to put it as it goes with stories of elves.
Skills: With their bodies being pure and near perfect they moved with such flow and elegance being in complete control of their own bodies. When they fought it would almost seem like they were almost dancing, no move wasted all having a flow of elegance. Due to their pure bodies infused with the direct power of the tree they gained enhanced strength, stronger than normal men (but not enough to warrant difference in Taijutsu damage).
Vision: All their senses got improved with the sealing of the Silmarillis, including their vision. They became able to see better in lower or higher light conditions than a normal human, allowing them near perfect vision in the dark. Additionally, they could see more clearly in the distance and have a better perception of space and color than most humans. However, it still pales in comparisson to any of the Doujutsu.
Intent sensing: This was inspired by the killing intent jutsu. With that you are able to amplify you're killing intent through your chakra. This on the other hand is the ability to sense killing intent even without the use of unique chakra sensing. With this would could sense anything with the intent to harm, destroy, kill, anything that isn't seen as pure. So for example earth spikes would be used to kill through nature, you'd be able to sense this, where as a earthen shield you wouldn't be able to sense as there is no harmful or evil intent behind this. This stems from the good intent intended when the sealing jutsu was done to create the clan's abilities. This was proven possible by the likes of Karin who could sense the darkness is Sasuke chakra and the lightness in Narutos. It would allow the user in a fight to sense when they are in danger from a sneak attack much like what some may call a "spider sense" as they would sense what's harmful to them and not of a pure nature.
Weapon: As is seen as tradition through the ages, the idea of elves have always been seen with bows and arrows, it goes with there accute senses, vision and reflexes to be able to execute such methods. Within their forest they had to patrol the borders and at the same time didn't want to show themselves to draw attention from the outside world and so their powers and bows came into play. They forged sacred bows (to be submitted as cw for clan) which don't use normal arrows. The uses releases chakra into their bow to create an arrow of holy fire chakra from their kg. The arrow can me made to be offensive or testive. Offensive would be the arrows of light that burn when they strike and purify. The testive would hit their target as a purifying light, if they bear negative intent it will harm them, if not it will pass staight through them. (all to be part of the weapon.