<input type="image" src="/images/btn_next.png">

input[type="image" i]
{
    cursor: pointer;
}

driver.find_element_by_xpath('//input[@type="image"][@src="/images/btn_next.png"]').click()

from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC

WebDriverWait(driver,20).until(EC.element_to_be_clickable((By.XPATH,'//input[@type="image"][@src="/images/btn_next.png"]'))).click()

driver.execute_script("arguments[0].click();",driver.find_element_by_xpath('//input[@type="image"][@src="/images/btn_next.png"]'))

driver.find_element_by_css_selector("input[src='/images/btn_next.png'][type='image']").click()

driver.find_element_by_xpath("//input[@src='/images/btn_next.png' and @type='image']").click()

WebDriverWait(driver, 20).until(EC.element_to_be_clickable((By.CSS_SELECTOR, "input[src='/images/btn_next.png'][type='image']"))).click()

WebDriverWait(driver, 20).until(EC.element_to_be_clickable((By.XPATH, "//input[@src='/images/btn_next.png' and @type='image']"))).click()

from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.common.by import By
from selenium.webdriver.support import expected_conditions as EC