Thanks for noticing. The key is bright lights. Preferably coming from several different angles to eliminate shadows. Alternatively, you can take them in the daytime near the biggest, brightest window in the house.
Here's a pic of my "studio" lol that I took a few months ago. Those clip-on lamps that you see are $4 LED desk lights from Walmart. The background is just 99 cent poster board. Also from Walmart.