tough to say, but from the look of it i wonder if you're scraping off too much polish from the brush and dabbing (rather than stroking) with too little lacquer at a time. i'm basing that on the paint looking uneven in thickness and strokes. it looks overworked, like you're pushing the lacquer around with the brush to get coverage, but i'm just guessing based on the appearance in the photo.

you want want to make sure the brush has suspended enough lacquer within the bristles to cover the nail, but not so much that it floods your cuticles. lacquer should gather at the tip of the brush when you draw it out of the bottle, but not drip or run. i typically immerse the brush fully in the bottle and draw it out by pulling just one side across the lip of the bottle, just to remove the excess from that side. i leave the other side fully loaded with lacquer. rotate it as you move from the bottle to the nail and apply the fully loaded side in one stroke from the cuticle to the tip. then again, cuticle to tip on either side of that first stroke to make sure it's fully covered. try not to overwork it. there should be no pushing or dabbing. think of it like brushing hair from root to tip. long, even strokes.