import requests
from bs4 import BeautifulSoup

url = 'https://pixabay.com/'
target_url = 'https://pixabay.com/images/search/office/'

headers = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36',
    "Accept-Language": "en-US;q=0.7,en;q=0.3",
    "Cache-Control": "no-cache",
}

with requests.Session() as s:
    s.headers.update(headers)
    r = s.get(url)
    print(r.status_code)
    r = s.get(target_url)
    print(r.status_code)

    results = []

    soup = BeautifulSoup(r.text, "lxml")
    for item in soup.select(".search_results a > img[src]"):
        src = item.get("src")
        if src is not None and 'blank.gif' not in src:
            print('src:', src)
            results.append(src)
        else:
            src = item.get("data-lazy")
            print('data-lazy:', src)
            results.append(src)

    print('len:', len(results))