is this allowed to use some stock image in design ? you din not mention that you copied exact S from stock image ?
https://www.google.com/search?biw=1366&bih=657&tbm=isch&sxsrf=ACYBGNQG-W1uGhwdw6y9xXm4b1F_o2N-EQ%3A1568388694194&sa=1&ei=VrZ7XYbEC-eP1fAPiv-4uAs&q=S+logo&oq=S+logo&gs_l=img.3..0i67l10.8130.9539..9790...0.0..0.290.1363.2-5......0....1..gws-wiz-img.......35i39j0.rafA4i0Mwok&ved=0ahUKEwiGx_KXj87kAhXnRxUIHYo_DrcQ4dUDCAc&uact=5#imgrc=sczxHWce5S_D4M: