Error with pictures and 'if' in Python TelegramBot. How to fix?

pyTelegramBotAPI Python 3.7

Bot in general works but an error occurs when the BOT should send the photo. When I write a bot message, in answer to which he must send a photo or a sticker, it goes but when next you enter the same command the bot sends nothing. I am a newbie so please suggest me how can I better write this code.

elif instead of if isn't working.

...
@bot.message_handler(content_types=["text"])

def bot_messages(message):
    if message.text.lower() == "Привет".lower():
        bot.send_message(message.from_user.id, "Ку! ✋. Напиши /welcome.")

    if message.text.lower() == "/welcome".lower():
        bot.send_message(message.from_user.id, "Я бот Римуру. Напиши название животного, например, 'кот', и я отправлю его картинку.")
        bot.send_sticker(message.from_user.id, sticker1)

    if message.text.lower() == "питон".lower():
        bot.send_photo(message.from_user.id, photo1)
    if message.text.lower() == "мышь".lower():
        bot.send_photo(message.from_user.id, photo2)
    if message.text.lower() == "кот".lower():
        bot.send_photo(message.from_user.id, photo3)
    if message.text.lower() == "жираф".lower():
...