Definitely take measurements and photos, weight loss is a really long, boring, annoying, frustrating and often demoralising journey. It can be very hard to keep going but having multiple opportunities to celebrate wins helps.
I have a whole heap of ways that I look for success to try to keep myself motivated.
I have lots of weight related goals to work towards - 7lb, 14lb, 5% bodyweight, 10% bodyweight, BMI overweight, BMI healthy....
Size related goals - size 18, size 16, size 14, lost 1 inch, 2 inches, 3 inches on waits.
Image related - I take photos monthly to compare face, torso, arms and legs. Being able to see my collarbones for example or losing a chin.
Health related - Apple Watch - resting heart rate decrease, respiration rate decrease, increased sleep quality.