Use that big window
As I said before, I have limited area to craft, however I have a big window right next to where I sit. Yes, this will be my source for natural light to take my pictures! A lot of times I just open my blinds, lay down my background and the pictures turn out wonderful! However, there are some pitfalls. First you need to find the right time of day the natural light hits your card just right. For me, the afternoon sun is best for me! Now what happens if there is no sun, well there is still natural light, you just need a little extra help! Sometimes if there is no sun, I use a LED ring light to add to the natural light and remember to change the settings on my camera. If the sun is out but not just as bright (partly cloudy), I use a light reflecting board covered in aluminum foil or just a white board on the opposite side of the window to reflect light onto the card. The main point I can make is find out what works for you. Just keep trying!