“Stuart Arends: Friends” at Gallery Schlesinger Limited, 24 E 73 Street, between Fifth and Madison Avenues, 212 734 3600) “Nobu Fukui” at Stephen Haller Gallery through May 18 (542 W26 Street, between 10th and 11th Avenues, 212 741 7777) “Alexander Liberman: No Regrets” at Ameringer Yohe, through April 24 (20 W 57th Street, bewteen fifth … Continued