We have developed a tablet application to support peer review learning for visual art education. The tablet-based front-end allows students to review others' work and provide comments in the form of written text and also comments drawn directly on the artwork (i.e., the direct comment). We hypothesize that (1) peer review would facilitate learning various techniques for visual art, and (2) students would find it useful to directly provide comment on other's artwork. To test these hypotheses, we conducted three classroom (in-vivo) studies over three years. The goal of this paper is to introduce the tablet-based peer review system and report results from the three in-vivo studies. The results show that (a) the table-based peer review system is as effective as the traditional classroom instruction, and (b) students tend to have a high expectation for the direct comment.