Very nice, though one point I would make is try to work in 3rd person omniscient, because when you're writing, you're writing with other peoples perspectives, and first person often acts like a barrier. Describe the scene, as if you were describing it to everyone elses character.
Wolf626 took a breath, lowering his stance. The crackle of electricity filling the air as he dumped energy from his core into the spell. As he did, silver lines traced along his body, following the grooves of his muscles. They flexed, the faint sound of metal on metal screeching could be heard as his muscles started to shrink down, expanding again, only to shrink down further. He now looked as if he were craved from metal. Slowly he released the breath, standing back up again. "I guess the training finally paid off."
A lot of that was telling people what made him casting the spell in that way special, when in reality you should be coaxing the other players to dig into it. Of course, a lot of context is missing from this individual post, but giving people an in to interact and ask questions, will really get people attacked to characters, because in roleplay that's what forms attatchments. Interaction. You need to get the player interested in your character, through their character, and you do that by not only writing and describing things from "Their" perspective, but also hooking them with small amounts of information, and reeling them in using more and more information as you interact with them.