Really clean channel art; I like that banner. It's elegant, it's informative and simple. Also kudos on posting 6 videos in the previous month; that's above average and if you are able to maintain that posting schedule it will benefit you well. 74 subscribers in 16 videos is also an accomplishment... growth is exponential and you are off to a great start. I will advise that you bury your head in the sand for the first 100 videos; you are not going to get the data feedback and analytics that you need to make educated assessments of your audience or your videos until about the 100 video mark.
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Your CTR is going to be the most telling bit of information regarding your thumbnails... so if you are getting 10% or better CTR then ignore everything I am about to say. You know your audience better than I and I can definitely be wrong about something that is based so heavily on personal preference.
But I am not a fan of your thumbnails. Your banner reflects that you channel is about being a 'Master of Class' and itself is a very elegant banner. But there is no elegance represented in your thumbnails. The images are on the whole kind of dull in their color scheme with only splashes of color. The font and text size... it might be ok but it appears to me to be difficult to read when scrolling and I am not sure it will stop the scroll. It might... maybe my eyes are just old (entirely possible). I do like the font setup in your '4 Great Ways to Boost Self-Confidence...' video. That works way better... but that is also a matter of personal preference.
Your video presentation is spot on, I'm not going to go into that. You know what you are doing. But I will advise that your SEO Strategy is almost non-existent and your Best-Practices are as well. These are some glaring deficiencies in your channel. I suggest taking some time to learn SEO strategy (we offer many tutorials on our TubeBuddy YouTube channel). It will benefit you greatly to optimize your videos for the Search Engines, and following your Best Practices will as well. Having things like a pinned comment with a link to a different video, Endscreens, Cards and Chapters are all part of the 'View Machine.' That is to say that when combined over the course of an entire library of videos they can create a substantial amount of additional views for your channel; they will increase overall watch time and they actually cause YouTube to cater more of your content to the viewers who take advantage of these cursory views.
