They look nice but it's hard to tell under the grow light. If don't already, invest in a Jewelers loupe. They're fairly inexpensive and they make it very easy for you to see the trichomes. Sometimes depending on the phone you have you can zoom in and get an idea of what your trics look like but a Jewelers loupe is the way to go in my opinion. I had best luck checking the plants in natural light, feel free to share some pictures of your plant taken in natural lighting rather than under the yellow light from the hps.