A cool reddit post on what people are suggesting for pro players o have as sets: http://www.reddit.com/r/DotA2/comments/2r01uo/which_pro_player_deserves_a_hero_set/
Your sculpts are fantastic but so much detail is being lost in the textures, and it looks like the masks are barely being used. Have you seen valve's texture/mask guide for dota 2? It shows you the methods they use to create higher contrast in the low res textures, stronger AO and a point light map could help a lot, and…
I know only 2 ways to import particles to dota2. The First is only for a hero items by the use of Vertex-Based Particles And there is nothing complicated because at the workshop page you have the special slot for particle's geometry file. The second way to make it with the Particle Editor. I hope this PDF Guide will help…