[HELP] Drawing code is too fast, I want the user to see what is going on.

For simplicity, you click a spot, an image is placed there, then calculations are done. If the calculations conclude the image placed is not correct (by rules of the game), then it removes the image.

I want the user to see the image placed then removed, but the coding runs through and places and removes it in the same update.

I've tried things like wait/idle/sleep etc. to pause the game but it turns out the "drawing update" happens after the calculations so it waits on a blank screen and then still places and removes the image at the same sequence after the wait.