@jada11 Adding on to grae313's great advice, taking a deep breath at the beginning of the squat movement can help keep your core tight and help prevent some of the forward leaning at the bottom of the squat.
@tina_p The woman in your goal photo has her underwear bands higher on her hips, which is more flattering especially for more bottom heavy ladies. I think you look fantastic! Slow and steady wins the race. Also, flattering clothing, lighting, and posing can really make profound difference!