I would love to be Teemo standing still invisible in the middle of all that...
"Never underestimate the power of the scout's code!"
As far as execution on this piece (and others in your gallery), I think you did a smashing job recreating them in this style.
If I had any critiques, it would be minor and of my own preferences.
-Sona's posture could be more linear (more proper)
-Syndra could have the head gear or something more to depict who she is. It could just be me, but I was lost on who she was for second until I read your description. She has a purple skin tone, rather than flesh tones. Also her personality is more dramatic and she appears to sentimental here.
That just me nit-picking. Overall, It's a good piece.