You appear to have adequate lighting but I would put more to get rid of the shadows. Do you like the color of the paint? If not what is your favorite color? I know why paint but in order to make this your space you might have to choose another color. What about a cutting table with storage? Make sure it is the right height to avoid fatique. As suggested, fake window or posters would help. Wall hangings and mementos in your favorite colors. Does the sofa and exercise equipment have to be stored in this room? This is your woman cave make it your own. I am retired now but I remember when I had young children I despertly needed space to call my own. Ask yourself what you want to make this space yours.