The Mirage 2000 is a further development of the Mirage III and Mirage V. Look in particular at the vertical stabiliser and cockpit to keep them apart. On the 2000 both are higher than on the predecessors, especially the single seat variants.
Dassault Mirage 4000
The Mirage 4000 is essentially a bigger, twin jet version of the Mirage 2000 with small canards at the air intakes. Additionally, it has a longer, true bubble canopy. (photo Michael Teiten/WikiMedia)
Dassault Mirage F1
The Mirage F1 is the only Mirage without a delta wing, but still has a lot of commonalities with the Mirage III and Mirage V. In particular the fuselage shape (including cockpit and air intakes) and the vertical stabiliser are typical Mirage.
Dassault Mirage III/Mirage 5 & IAI Finger/Nesher
The first generation Mirage delta wing fighters have the characteristic semi-circular air intakes in front of the wings, with semi-circular inlet cones. The vertical stabiliser is a cut-off triangle and the canopy is nearly flush with the top of the fuselage.
The air intakes of the Rafale are nearly elliptical, and placed diagonally at the side of the curved forward fuselage in front of the wings. This makes it stand apart from for example the (single engine) Saab Gripen and Eurofighter Typhoon, which also have delta wings, a single vertical stabiliser and canard configuration.
The twin jet Alpha Jet has high, swept wings, and a conventional tail. The nacelles are not placed directly under the wings, there is some space between the wings and the nacelles, like on the PZL Iryda. Looking at the shape of the air intakes is the most obvious way of keeping them apart.
DeHavilland Canada DHC-1 Chipmunk
The Chipmunk is characterised by the inline engine with pistons at the bottom, a tandem canopy and a vertical stabiliser that is the half of an oval standing right up.
The Beaver has multiple appearances, but is often characterised by a trapezium shape cabin window on each side, and a triangular vertical stabiliser with curved corners and a small dorsal fin. Conversions may give it a different appearance though, but the general shape remains.
This large bushplane is characterised by a cruciform tail of which the vertical stabiliser is curved from the dorsal fin over the top to the tail cone. The cabin windows are nearly square with rounded corners.
The Caribou tactical transport aircraft has a rear fuselage sloping up strongly to facilitate rear loading. Above is a nearly rectangular vertical stabiliser. The landing gear retracts forward in the engine nacelles.