Sketches/Designing

Designing characters and came up with a story line I like. This will probably be the main character, I was studying male anatomy so decided to draw him topless ^///^... I normally say I came up with an idea for a manga but I'm never happy with it but this one is badass (if I say so myself). I would really appreciate improvement points, tips or parts I did well it means a lot to me so I can improve! Thank youuu ~