His tail could stand to be just a little bit more plump, but basically he looks good. My adult female of similar size (she's just a hair under 10 inches in total length and ~75 grams last time I weighed her) eats 3-4 large crickets every 3 days. It sounds like you're doing something similar, so I can't really say anything bad about it. That said, it'll really work out best if you can observe what the animal does and adjust based on that. If you give him 3 crickets and he chomps them all down and is obviously looking for more, give him some more and/or feed him every 2 days instead of every 3. If he's ignoring crickets, feed less and/or space out the feedings a bit more. If you're paying attention, he'll tell you what you need to do.