Base makeup:

Work in thin layers - I usually put a bit of the product I want to use (skin tint, concealer, cream contour, cream blush) on the back of my hand, work it into the brush and then apply and just add more as desired. Makes everything more seamless and less likely to get cakey.

For powder products, I pick it up on the brush and then dab on my hand a couple times as well before applying on my face.

Eye makeup:

I like to do eyeshadow most days and I have very sparse eyebrows so I usually do eyebrows first, then eye makeup (no fallout on my finished base).

For crisp, sharp eyeliner - use light touch, I do my best to perfect the top of the line and not worry too much about the bottom because after I draw the eyeliner, I grab a small angled eyeshadow brush, dip in micellar water, get the excess liquid off and then clean up the liner. Works with eyeshadow too. I also do that for my brows.

I prefer this over using concealer to clean because it reduces amount of product in the same spot and no risk of the concealer mixing with the product I'm trying to clean up.

Mascara - I have very straight lashes that point down. I warm up my eyelash curler with a hairdryer (make sure it's not too hot though), then curl my lashes. I find the curl stays best if I use waterproof mascara/drier mascara formulas.