Unless you are just posting the screenshot of a Royal or some crazy hand to a forum, why would you take a Screenshot? It doesn't give any information about how the hand went, just the end result(ie. doesn't show what the bets were and such, like a hand history would), therefore it would not help you in the least to improve your game. What Jilly said would help you a lot, being able to review your hands afterwords. Capturing your play on video is a good way to go back through and find some leaks, possibly in your betting patterns and even the amount of time it takes you to make a call/raise with good vs. bad hands(something hand history cannot tell you).