My goal is to build muscle, especially in the arms/biceps.

Originally I was doing about 10 pushups a day along with some bicep stretches (wall stretch, using rollers, deltoid stretch, etc). In mid-June I started doing 25 pushups daily since I wanted to challenge myself (and I realized 10 a day is close to nothing). So, I continued with 25 daily, up until mid-July because I didn't see any noticeable muscle gain. Again, I upped the ante to 40 a day. Now I'm still doing 40 per day but I have yet to see my muscles getting bigger.

Am I being too impatient, or should I keep upping the count? Thanks!

Note: I'm doing a mix of regular on-the-floor pushups and modified pushups, but mostly regulars