This is the best app to create custom stickers for WhatsApp.
You can create custom stickers using photos of your gallery. There are a lot of options to erase parts of your pictures and create your perfect sticker.
You can also write custom texts on your stickers with different colors and there are a lot of font options and styles.
Additionally you can add existing emojis to your new sticker.
Emojis and photos can be customized with hue color and saturation changes.