Welcome to the forums!! I hope you enjoy your time here and that it is productive!
Your concepts are looking pretty good so far for sure, and I really like your character sheets for Jayde. Other than the stuff Malcom has already pointed out, I would also like to point out that Tanaka's feet could probably be a bit larger in size, but quite frankly that may just be a style choice on my part. Your line art is looking pretty good and I look forward to seeing more designs and sketches from you in the future!! ^__^
I would also be remiss if I didn't properly appreciate your thank you pic, it looks really nice!